Dyfyniad APA

Hickman, G. C., & Hickman, S. M. (2002). The ecology action guide. San Francisco: Benjamin Cummings.

Dyfyniad Arddull Chicago

Hickman, Graham C., và Susan M. Hickman. The Ecology Action Guide. San Francisco: Benjamin Cummings, 2002.

Dyfyniad MLA

Hickman, Graham C., và Susan M. Hickman. The Ecology Action Guide. San Francisco: Benjamin Cummings, 2002.

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