APA (7th ed.) Citation

Severin, T. (1968). Explorers of the Mississippi ([1st American ed.].). Knopf.

Chicago Style (17th ed.) Citation

Severin, Timothy. Explorers of the Mississippi. [1st American ed.]. New York: Knopf, 1968.

MLA (9th ed.) Citation

Severin, Timothy. Explorers of the Mississippi. [1st American ed.]. Knopf, 1968.