Dyfyniad APA

Curtis, R. K. (1982). Evolution or extinction: The choice before us. Pergamon Press.

Dyfyniad Arddull Chicago

Curtis, Richard K. Evolution or Extinction: The Choice Before Us. Oxford: Pergamon Press, 1982.

Dyfyniad MLA

Curtis, Richard K. Evolution or Extinction: The Choice Before Us. Pergamon Press, 1982.

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