APA (7th ed.) Citation

Zeilik, M., & Gregory, S. A. (1998). Introductory astronomy & astrophysics (4th ed.). Saunders College Pub.

Chicago Style (17th ed.) Citation

Zeilik, Michael, and Stephen A. Gregory. Introductory Astronomy & Astrophysics. 4th ed. Fort Worth: Saunders College Pub, 1998.

MLA (9th ed.) Citation

Zeilik, Michael, and Stephen A. Gregory. Introductory Astronomy & Astrophysics. 4th ed. Saunders College Pub, 1998.