Dyfyniad APA

Cunningham, W. P., & Saigo, B. W. (1999). Environmental Science. Boston: McGraw-Hill.

Dyfyniad Arddull Chicago

Cunningham, William P., và Barbara Woodworth Saigo. Environmental Science. Boston: McGraw-Hill, 1999.

Dyfyniad MLA

Cunningham, William P., và Barbara Woodworth Saigo. Environmental Science. Boston: McGraw-Hill, 1999.

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