APA (7th ed.) Citation

Zeilik, M., & Gregory, S. A. (1998). Introductory astronomy and astrophysics (4th edition.). Saunders College Publishing.

Chicago Style (17th ed.) Citation

Zeilik, Michael, and Stephen A. Gregory. Introductory Astronomy and Astrophysics. 4th edition. Fort Worth: Saunders College Publishing, 1998.

MLA (8th ed.) Citation

Zeilik, Michael, and Stephen A. Gregory. Introductory Astronomy and Astrophysics. 4th edition. Saunders College Publishing, 1998.