I've only listed books and none of the periodical articles that I used. The links will take you to the University of Arkansas and their wonderful Library of Iberian Resources Online (LIBRO).
Blackmore, Josiah. Queer Iberia: sexualities, cultures, and crossings from the Middle Ages to the Renaissance. Durham: Duke University Press, 1999.
Boswell, John. Same-sex unions in pre-modern Europe. New York: Vintage, 1995.
Cleminson, Richard. Los Invisibles: a history of male homosexuality in Spain, 1850-1939. Cardiff: University of Wales Press, 2007.
Goodrich, Michael. The unmentionable vice: homosexuality in the later Medieval period. Santa Barbara, CA: ABC-Clio, Inc., 1979.
Tin, Louis-Georges [trans. Marek Redburn]. The dictionary of homophobia: a global history of gay & lesbian experience. Vancouver: Arsenal Pulp Press, 2008.
Bishko, Charles Julian. Studies in Medieval Spanish frontier history. Variourum Reprints, 1980.
Chaytor, Henry J. A history of Aragon and Catalonia. Methuen, 1933.
Constable, Olivia Remie, ed. Medieval Iberia: readings from Christian, Muslim, and Jewish resources. 2nd ed. Philadelphia: University of Pennsylvania Press.
Garza, Randal P. Understanding plague: the medical and imaginative texts of Medieval Spain. New York: Peter Lang, 2008.
Netanyahu, Benzion. The origins of the Inquisition in fifteenth century Spain. New York: Random House, 1995.
Powers, James F. A society organized for war: the Iberian municipal militias in the central Middle Ages, 1000-1284. University of California Press, 1988.
Scott, S.P., trans. The Visigothic Code (Forum iudicum). Boston Book Company, 1910.
WWI and the SPANISH CIVIL WAR
Ayrton, Pete. No Pasarán!: writings from the Spanish Civil War. Toronto: Pegasus Books, 2016.
Beevor, Antony. The battle for Spain: the Spanish Civil War, 1936-1939. New York: Penguin Publishing Group, 2006.
Brenan, Gerald. The Spanish labyrinth: an account of the social and political background of the Spanish Civil War. Cambridge, United Kingdom: Cambridge University Press, 2014.
Buckley, Henry. The life and death of the Spanish Republic: a witness to the Spanish Civil War. London: I.B. Tauris & Company, Limited, 2014.
Gilbert, Martin. The Somme: heroism and horror in the First World War. New York: Henry Holt and Company, 2006.
Hochschild, Adam. Spain in Our Hearts: Americans in the Spanish Civil War, 1936-1939. New York: Houghton Mifflin Harcourt, 2016.
Orwell, George. Homage to Catalonia. Boston: Houghton Mifflin Harcourt, 2015.
Preston, Paul. The Spanish Civil War: reaction, revolution, revenge. New York: W.W. Norton & Company, 2007.
Preston, Paul. The Spanish Holocaust: inquisition and extermination in twentieth-century Spain. New York: W.W. Norton & Company, 2013.
Rhodes, Richard. Hell and good Company: the Spanish Civil War and the world it made. New York: Simon and Schuster, 2015.
Steel, Nigel and Hart, Peter. Passchendaele: the sacrificial ground. London: Orion House, 2004.
Yglesias, Jose. The Franco years: the untold human story of life under Spanish fascism. Indianapolis: The Bobbs-Merrill Company, Inc., 1977.
CULTS / grimoires / religion
Charlesworth, James H. The Old Testament pseudepigrapha: apocalyptic literature & testaments. New York: Doubleday, 1983.
Charlesworth, James H. The Old Testament pseudepigrapha: expansions of the “Old Testament” and legends, wisdom and philosophical literature, prayers, psalms and odes, fragments of lost Judeo-Hellenistic works. New York: Doubleday, 1983.
Christian, William A., Jr. Apparitions in late Medieval and Renaissance Spain. Princeton University Press, 1981.
Davies, Owen. Grimoires: a history of magic books. Oxford: Oxford University Press, 2009.
Ginzberg, Louis. The legends of the Jews. Vols. 1-7. Baltimore: The Johns Hopkins University Press, 1937.
Glick, Thomas F. Islamic and Christian Spain in the early Middle Ages. Princeton University Press, 1979.
Goodrick-Clarke, Nicholas. The occult roots of Nazism: secret Aryan cults and their influence on Nazi ideology. New York: New York University Press, 1992.
Hale, Susan Elizabeth. Sacred space, sacred sound: the acoustic mysteries of holy places. Wheaton, IL: Quest Books, 2007.
Kieckhefer, Richard. Forbidden rites: a necromancer's manual of the fifteenth century. Pennsylvania: The Pennsylvania State University Press, 1997.
Maggi, Armando. In the company of demons: unnatural beings, love, and identity in the Italian Renaissance. Chicago: University of Chicago Press, 2006.
McKenna, Stephen. Paganism and pagan survivals in Spain up to the fall of the Visigothic Kingdom. Catholic University of America Press, 1938.
Pagels, Elaine. Adam, Eve, and the serpent. New York: Random House, 1988.
Wolf, Kenneth Baxter. Christian martyrs in Muslim Spain. Cambridge University Press, 1988.
Martorell, Joanot (trans. David H. Rosenthal). Tirant Lo Blanc. New York: Schocken Books, 1984.
Middleton, Christopher and Garza-Falcon, Leticia (trans.). Andalusian Poems. Boston: David R. Godine Publishers, 1994.
Rodriguez de Montalvo, Garci (trans. Edwin B. Place and Herbert C. Behm). Amadis of Gaul: a novel of chivalry of the 14th Century presumably first written in Spanish. Lexington, KY: The University of Kentucky.
Ruiz, Juan (trans. Elisha K. Kane). The book of good love of the archpriest of Hita, Juan Ruiz. Newark: Juan de la Cuesta, 2001.