Dyfyniad APA

Lecomber, R. (1979). The econonics of natural resources. New York: The Macmillan Press.

Dyfyniad Arddull Chicago

Lecomber, Richard. The Econonics of Natural Resources. New York: The Macmillan Press, 1979.

Dyfyniad MLA

Lecomber, Richard. The Econonics of Natural Resources. New York: The Macmillan Press, 1979.

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