APA (7th ed.) Citation

Leppard, H. M. (1938). World, continents. University of Chicago Press.

Chicago Style (17th ed.) Citation

Leppard, Henry M. World, Continents. Chicago, Ill.: University of Chicago Press, 1938.

MLA (8th ed.) Citation

Leppard, Henry M. World, Continents. University of Chicago Press, 1938.