Dyfyniad APA

Chiras, D. D. (1990). Environmental science: Action for a sustainable future. Redwood City, Calif: Benjamin/Cummings Pub. Co.

Dyfyniad Arddull Chicago

Chiras, Daniel D. Environmental Science: Action for a Sustainable Future. Redwood City, Calif: Benjamin/Cummings Pub. Co, 1990.

Dyfyniad MLA

Chiras, Daniel D. Environmental Science: Action for a Sustainable Future. Redwood City, Calif: Benjamin/Cummings Pub. Co, 1990.

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