APA (7th ed.) Citation

Clark, W. R. (1964). Explorers of the world / by W.R. Clark. Aldus.

Chicago Style (17th ed.) Citation

Clark, W. R. Explorers of the World / by W.R. Clark. Aldus, 1964.

MLA (9th ed.) Citation

Clark, W. R. Explorers of the World / by W.R. Clark. Aldus, 1964.

Warning: These citations may not always be 100% accurate.