Amer, Sahar. 2008. Crossing Borders: Love Between Women in Medieval French and Arabic Literatures. University of Pennsylvania Press, Philadelphia. ISBN 978-0-8122-4087-0

This is a fabulous book. I've covered a couple of Amer's articles previously and there is some overlap in material, but this study lays out the entire framework of her research into the interactions of French and Arabic influences in certain medieval romances with themes of female same-sex desire. Her work is a prime example of both the difficulties and rewards of digging deeply into some of the less-studied literary works with lesbian-like themes.