Seeds, M. A. (1990). Foundations of astronomy (1990 edition.). Wadsworth Publishing Company.
Lua i Stíl Chicago (17ú heag.)Seeds, Michael A. Foundations of Astronomy. 1990 edition. Belmont, California: Wadsworth Publishing Company, 1990.
Lua MLA (8ú heag.)Seeds, Michael A. Foundations of Astronomy. 1990 edition. Wadsworth Publishing Company, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.