APA (7th ed.) Zitazioa
Helms, E. E. (1923). God in history. Light and Life Press.
Chicago Style (17th ed.) Zitazioa
Helms, Elmer Ellsworth. God in History. Washington Boulevard: Light and Life Press, 1923.
MLA (9th ed.) Zitazioa
Helms, Elmer Ellsworth. God in History. Light and Life Press, 1923.
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