Dyfyniad APA

Facts on File, Inc, & Yule, J. (1980). Concise encyclopedia of the sciences. Facts on File.

Dyfyniad Arddull Chicago

Facts on File, Inc, and John-David Yule. Concise Encyclopedia of the Sciences. New York, N.Y.: Facts on File, 1980.

Dyfyniad MLA

Facts on File, Inc, and John-David Yule. Concise Encyclopedia of the Sciences. Facts on File, 1980.

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