Dyfyniad APA

(1963). Careers in conservation opportunities in natural resources. New York: Ronald.

Dyfyniad Arddull Chicago

Careers in Conservation Opportunities in Natural Resources. New York: Ronald, 1963.

Dyfyniad MLA

Careers in Conservation Opportunities in Natural Resources. New York: Ronald, 1963.

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