APA (7th ed.) Citation

Wyatt, S. P. (1971). Principles of astronomy (2d ed.). Allyn and Bacon.

Chicago Style (17th ed.) Citation

Wyatt, Stanley P. Principles of Astronomy. 2d ed. Boston: Allyn and Bacon, 1971.

MLA (9th ed.) Citation

Wyatt, Stanley P. Principles of Astronomy. 2d ed. Allyn and Bacon, 1971.