Dyfyniad APA

Calder, N. (1973). Nature in the round: A guide to environmental science. Viking Press.

Dyfyniad Arddull Chicago

Calder, Nigel. Nature in the Round: A Guide to Environmental Science. New York: Viking Press, 1973.

Dyfyniad MLA

Calder, Nigel. Nature in the Round: A Guide to Environmental Science. Viking Press, 1973.

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