Dyfyniad APA

Cunningham, W. P., & Cunningham, M. A. (2020). Principles of environmental science: Inquiry & applications (Ninth editon.). McGraw-Hill Education.

Dyfyniad Arddull Chicago

Cunningham, William P., and Mary Ann Cunningham. Principles of Environmental Science: Inquiry & Applications. Ninth editon. New York, NY: McGraw-Hill Education, 2020.

Dyfyniad MLA

Cunningham, William P., and Mary Ann Cunningham. Principles of Environmental Science: Inquiry & Applications. Ninth editon. McGraw-Hill Education, 2020.

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