APA način citiranja (7. izdanje)

Harnack, A. (1957). What is Christianity? Harper & Brothers.

Čikaški stil citiranja (17. izdanje)

Harnack, Adolf. What Is Christianity? New York: Harper & Brothers, 1957.

MLA način citiranja (9. izdanje)

Harnack, Adolf. What Is Christianity? Harper & Brothers, 1957.