Dyfyniad APA

Parker, S. P. (1992). Mcgraw-hill encyclopedia of environmental science & engineering. New York: McGraw-Hill.

Dyfyniad Arddull Chicago

Parker, Sybil P. Mcgraw-hill Encyclopedia of Environmental Science & Engineering. New York: McGraw-Hill, 1992.

Dyfyniad MLA

Parker, Sybil P. Mcgraw-hill Encyclopedia of Environmental Science & Engineering. New York: McGraw-Hill, 1992.

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