Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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