Cita APA (7th ed.)

Seeds, M. A. (1990). Foundations of astronomy (1990 edition.). Wadsworth Publishing Company.

Cita Chicago (17th ed.)

Seeds, Michael A. Foundations of Astronomy. 1990 edition. Belmont, California: Wadsworth Publishing Company, 1990.

Cita MLA (8th ed.)

Seeds, Michael A. Foundations of Astronomy. 1990 edition. Wadsworth Publishing Company, 1990.