APA (7th ed.) Citation

Leppard, H. M. (1939). World, Mercator. University of Chicago Press.

Chicago Style (17th ed.) Citation

Leppard, Henry M. World, Mercator. Chicago, Ill.: University of Chicago Press, 1939.

MLA (9th ed.) Citation

Leppard, Henry M. World, Mercator. University of Chicago Press, 1939.