Gaya APA

Harnack, A, V, , (. (1986). What is Christianity? Transl. by Th. B. Saunders, introd. by R. Boltman, repr. : Das Wesen des Christentums. 1900 . Philadelphia: Fortress.

Gaya MLA

Harnack, A., Von, , (1851-1930). "What is Christianity? Transl. by Th. B. Saunders, introd. by R. Boltman, repr. : Das Wesen des Christentums. 1900 ". Philadelphia: Fortress, 1986. Buku.