APA (7th ed.) Citation

Zeilek & Smith. (1987). Introductory astronomy and astrophysics (2nd ed.). CBS College Publishing.

Chicago Style (17th ed.) Citation

Zeilek and Smith. Introductory Astronomy and Astrophysics. 2nd ed. New York: CBS College Publishing, 1987.

MLA (8th ed.) Citation

Zeilek and Smith. Introductory Astronomy and Astrophysics. 2nd ed. CBS College Publishing, 1987.

Warning: These citations may not always be 100% accurate.