Van Allen, J. A. (1993). 924 elementary problems and answers in solar system astronomy. University of Iowa Press.
Cita Chicago Style (17a ed.)Van Allen, James Alfred. 924 Elementary Problems and Answers in Solar System Astronomy. Iowa City: University of Iowa Press, 1993.
Cita MLA (8a ed.)Van Allen, James Alfred. 924 Elementary Problems and Answers in Solar System Astronomy. University of Iowa Press, 1993.
Precaución: Estas citas no son 100% exactas.