Dyfyniad APA

JOHNSON, G. B., & OBER, W. C. (2010). Essentials of the living world. Mc Graw-Hill.

Dyfyniad Arddull Chicago

JOHNSON, George B., and William C. OBER. Essentials of the Living World. Mc Graw-Hill, 2010.

Dyfyniad MLA

JOHNSON, George B., and William C. OBER. Essentials of the Living World. Mc Graw-Hill, 2010.

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