APA (7th ed.) Citation

Machen, J. G. (1930). The virgin birth of Christ. Harper.

Chicago Style (17th ed.) Citation

Machen, John Gresham. The Virgin Birth of Christ. New York [u.a.]: Harper, 1930.

MLA (9th ed.) Citation

Machen, John Gresham. The Virgin Birth of Christ. Harper, 1930.