As with my research page for Miserere, I've only listed books and none of the periodical articles that I used. The links are live and will take you to the University of Arkansas and their wonderful Library of Iberian Resources Online (LIBRO). I used their resources extensively for Garden in Umber.
Bealer, Alex W. The art of blacksmithing. New York: Funk & Wagnalls, 1969.
Bishko, Charles Julian. Studies in Medieval Spanish frontier history. Variourum Reprints, 1980.
Blandford, Percy W. Practical blacksmithing and metalworking. 2nd ed. New York: Tab Books, 1988.
Boswell, John. Same-sex unions in pre-modern Europe. New York: Vintage, 1995.
Chaytor, Henry J. A history of Aragon and Catalonia. Methuen, 1933.
Christian, William A., Jr. Apparitions in late Medieval and Renaissance Spain. Princeton University Press, 1981.
Garza, Randal P. Understanding plague: the medical and imaginative texts of Medieval Spain. New York: Peter Lang, 2008.
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.
Goodrich, Michael. The unmentionable vice: homosexuality in the later Medieval period. Santa Barbara, CA: ABC-Clio, Inc., 1979.
Hale, Susan Elizabeth. Sacred space, sacred sound: the acoustic mysteries of holy places. Wheaton, IL: Quest Books, 2007.
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.
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.
Wolf, Kenneth Baxter. Christian martyrs in Muslim Spain. Cambridge University Press, 1988.