APA (7th ed.) Citation

Zeilik, M. (1987). Introductory astronomy and astrophysics (2. ed.). Saunders.

Chicago Style (17th ed.) Citation

Zeilik, Michael. Introductory Astronomy and Astrophysics. 2. ed. Philadelphia, Pa. <<[u.a.]>>: Saunders, 1987.

MLA (9th ed.) Citation

Zeilik, Michael. Introductory Astronomy and Astrophysics. 2. ed. Saunders, 1987.