Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.