APA (7th ed.) Zitazioa

Hartmann, W. K. (1978). Astronomy: The cosmic journey (2nd ed.). Wadsworth.

Chicago Style (17th ed.) Zitazioa

Hartmann, William K. Astronomy: The Cosmic Journey. 2nd ed. Belmont, Calif: Wadsworth, 1978.

MLA (9th ed.) Zitazioa

Hartmann, William K. Astronomy: The Cosmic Journey. 2nd ed. Wadsworth, 1978.