Tohutoro APA (7th ed.)
Harnack, A. (1957). What is Christianity? Peter Smith Publishers.
Tohutoru Kātū Chicago (17th ed.)
Harnack, Adolf. What Is Christianity? U.S.A: Peter Smith Publishers, 1957.
Tohutoro MLA (9th ed.)
Harnack, Adolf. What Is Christianity? Peter Smith Publishers, 1957.
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