APA (7th ed.) Citation

Nourse, A. E. (1960). Nine planets ([1st ed.].). Harper.

Chicago Style (17th ed.) Citation

Nourse, Alan Edward. Nine Planets. [1st ed.]. New York: Harper, 1960.

MLA (9th ed.) Citation

Nourse, Alan Edward. Nine Planets. [1st ed.]. Harper, 1960.