APA

Humphries T. L., . (2013). Ascetic Pneumatology from John Cassian to Gregory the Great. New York: Oxford University Press.

Chicago

Humphries Thomas L, . 2013. Ascetic Pneumatology from John Cassian to Gregory the Great. New York: Oxford University Press.

Harvard

Humphries T. L., . (2013). Ascetic Pneumatology from John Cassian to Gregory the Great. New York: Oxford University Press.

MLA

Humphries Thomas L, . Ascetic Pneumatology from John Cassian to Gregory the Great. New York: Oxford University Press. 2013.