Seeds, M. A. (1990). Foundations of astronomy (1990 edition.). Wadsworth Publishing Company.
Citazione stile Chigago Style (17a edizione)Seeds, Michael A. Foundations of Astronomy. 1990 edition. Belmont, California: Wadsworth Publishing Company, 1990.
Citatione MLA (8a ed.)Seeds, Michael A. Foundations of Astronomy. 1990 edition. Wadsworth Publishing Company, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.