Dyfyniad APA

Krauskopf, K. B. 1., & Beiser, A. (2008). The physical universe (12th ed.). Boston: McGraw-Hill Higher Education.

Dyfyniad Arddull Chicago

Krauskopf, Konrad B. 1910-2003., và Arthur Beiser. The Physical Universe. 12th ed. Boston: McGraw-Hill Higher Education, 2008.

Dyfyniad MLA

Krauskopf, Konrad B. 1910-2003., và Arthur Beiser. The Physical Universe. 12th ed. Boston: McGraw-Hill Higher Education, 2008.

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