Dyfyniad APA
Carey Steven D. & Beiser, A. (2000). The physical universe (9th ed.). McGraw-Hill.
Dyfyniad Arddull Chicago
Carey Steven D. and Arthur Beiser. The Physical Universe. 9th ed. Boston: McGraw-Hill, 2000.
Dyfyniad MLA
Carey Steven D. and Arthur Beiser. The Physical Universe. 9th ed. McGraw-Hill, 2000.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.