APA (7th ed.) Citation

Keltie, J. S., & Keller, A. G. (1916). Africa. Collier.

Chicago Style (17th ed.) Citation

Keltie, John Scott, and Albert Galloway Keller. Africa. New York: Collier, 1916.

MLA (9th ed.) Citation

Keltie, John Scott, and Albert Galloway Keller. Africa. Collier, 1916.