Dyfyniad APA

Erickson, S. L. (1999). Fundamentals of environmental management. John Wiley.

Dyfyniad Arddull Chicago

Erickson, Steven L. Fundamentals of Environmental Management. New York: John Wiley, 1999.

Dyfyniad MLA

Erickson, Steven L. Fundamentals of Environmental Management. John Wiley, 1999.

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