Dyfyniad APA

Keith, L. H. (1988). Principles of environmental sampling. American Chemical Society.

Dyfyniad Arddull Chicago

Keith, Lawrence H. Principles of Environmental Sampling. Washington, D.C: American Chemical Society, 1988.

Dyfyniad MLA

Keith, Lawrence H. Principles of Environmental Sampling. American Chemical Society, 1988.

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