APA-ийн эшлэл(7 дахь хэвлэлт)

ebrary, Inc, Classen, A., & Sandidge, M. (2010). Friendship in the Middle Ages and early modern age: Explorations of a fundamental ethical discourse. Walter de Gruyter.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

ebrary, Inc, Albrecht Classen, ба Marilyn Sandidge. Friendship in the Middle Ages and Early Modern Age: Explorations of a Fundamental Ethical Discourse. Berlin ; New York: Walter de Gruyter, 2010.

MLA -ийн эшлэл (9 дэх хэвлэлт)

ebrary, Inc, et al. Friendship in the Middle Ages and Early Modern Age: Explorations of a Fundamental Ethical Discourse. Walter de Gruyter, 2010.