APA (7th ed.) Citation

Williams, L. O. (1961). Tropical American plants. Chicago Natural History Museum.

Chicago Style (17th ed.) Citation

Williams, Louis O. Tropical American Plants. [Chicago]: Chicago Natural History Museum, 1961.

MLA (9th ed.) Citation

Williams, Louis O. Tropical American Plants. Chicago Natural History Museum, 1961.

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