Cita APA (7a ed.)

Hartmann, W. K. (1978). Astronomy: The cosmic journey. Wadsworth Publishing Company.

Cita Chicago Style (17a ed.)

Hartmann, William K. Astronomy: The Cosmic Journey. Belmont: Wadsworth Publishing Company, 1978.

Cita MLA (9a ed.)

Hartmann, William K. Astronomy: The Cosmic Journey. Wadsworth Publishing Company, 1978.