APA (7th ed.) Citation

Sinclair, U. B. (1949). O shepherd speak! Viking Press.

Chicago Style (17th ed.) Citation

Sinclair, Upton Beall. O Shepherd Speak! New York: Viking Press, 1949.

MLA (9th ed.) Citation

Sinclair, Upton Beall. O Shepherd Speak! Viking Press, 1949.