Dyfyniad APA

(1991). Environmental sampling and analysis: A practical guide / by Lawrence H. Keith.

Dyfyniad Arddull Chicago

Environmental Sampling and Analysis: A Practical Guide / by Lawrence H. Keith. 1991.

Dyfyniad MLA

Environmental Sampling and Analysis: A Practical Guide / by Lawrence H. Keith. 1991.

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