Dyfyniad APA

Cunningham, W. P. (2007). Environmental science: A globl concern. Boston: McGraw-Hill Higher Education.

Dyfyniad Arddull Chicago

Cunningham, William P. Environmental Science: A Globl Concern. Boston: McGraw-Hill Higher Education, 2007.

Dyfyniad MLA

Cunningham, William P. Environmental Science: A Globl Concern. Boston: McGraw-Hill Higher Education, 2007.

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