Dyfyniad APA

(1961). Economics of watershed planning. Ames, Iowa: The lowa State University Press.

Dyfyniad Arddull Chicago

Economics of Watershed Planning. Ames, Iowa: The lowa State University Press, 1961.

Dyfyniad MLA

Economics of Watershed Planning. Ames, Iowa: The lowa State University Press, 1961.

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