Dyfyniad APA

Johnson, G. B. 1. (2010). Essentials of the living world (3rd ed.). Dubuque, IA: McGraw-Hill.

Dyfyniad Arddull Chicago

Johnson, George B. 1942-. Essentials of the Living World. 3rd ed. Dubuque, IA: McGraw-Hill, 2010.

Dyfyniad MLA

Johnson, George B. 1942-. Essentials of the Living World. 3rd ed. Dubuque, IA: McGraw-Hill, 2010.

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