Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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