APA (7th ed.) Citation

(1941). Ice age problem [climate issues in South America]. [s.n.].

Chicago Style (17th ed.) Citation

Ice Age Problem [climate Issues in South America]. [Washington]: [s.n.], 1941.

MLA (9th ed.) Citation

Ice Age Problem [climate Issues in South America]. [s.n.], 1941.

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