Cita APA

Zeilik, M., & Smith, E. v. P. (1987). Introductory astronomy and astrophysics (2nd ed.). Saunders College Pub..

Citación estilo Chicago

Zeilik, Michael, y Elske v. P. Smith. Introductory Astronomy and Astrophysics. 2nd ed. Philadelphia: Saunders College Pub., 1987.

Cita MLA

Zeilik, Michael, y Elske v. P. Smith. Introductory Astronomy and Astrophysics. 2nd ed. Saunders College Pub., 1987.