APA Citation

Harnack, A. v. (1901). What is Christianity? New York: G.P. Putnam's Sons : London : Williams and Norgate.

Chicago Style Citation

Harnack, Adolf von. What Is Christianity? New York: G.P. Putnam's Sons : London : Williams and Norgate, 1901.

MLA Citation

Harnack, Adolf von. What Is Christianity? New York: G.P. Putnam's Sons : London : Williams and Norgate, 1901.

Warning: These citations may not always be 100% accurate.