APA (7th ed.) Citation

Van Allen, J. A. (1993). 924 elementary problems and answers in solar system astronomy. University of Iowa Press.

Chicago Style (17th ed.) Citation

Van Allen, James Alfred. 924 Elementary Problems and Answers in Solar System Astronomy. Iowa City: University of Iowa Press, 1993.

MLA (8th ed.) Citation

Van Allen, James Alfred. 924 Elementary Problems and Answers in Solar System Astronomy. University of Iowa Press, 1993.