APA-viite (7. p.)
Classen, A. (2014). Mental health, spirituality, and religion in the Middle Ages and early Modern age. De Gruyter.
Chicago-viite (17. p.)
Classen, Albrecht. Mental Health, Spirituality, and Religion in the Middle Ages and Early Modern Age. Berlin ; Boston: De Gruyter, 2014.
MLA-viite (9. p.)
Classen, Albrecht. Mental Health, Spirituality, and Religion in the Middle Ages and Early Modern Age. De Gruyter, 2014.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.