APA-čujuhus (7. p.)
Harnack, A. (1957). What is Christianity? Peter Smith Publishers.
Chicago-čujuhus (17. p.)
Harnack, Adolf. What Is Christianity? U.S.A: Peter Smith Publishers, 1957.
MLA-čujuhus (9. p.)
Harnack, Adolf. What Is Christianity? Peter Smith Publishers, 1957.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.