APA (7th ed.) Citation

Baker, R. H., & Fredrick, L. W. (1971). Astronomy (9th ed.). Van Nostrand Reinhold.

Chicago Style (17th ed.) Citation

Baker, Robert H., and Lawrence W. Fredrick. Astronomy. 9th ed. New York: Van Nostrand Reinhold, 1971.

MLA (9th ed.) Citation

Baker, Robert H., and Lawrence W. Fredrick. Astronomy. 9th ed. Van Nostrand Reinhold, 1971.