Dyfyniad APA

Watson, D. J., & Yapp, W. B. (1958). The biological productivity of Britain. Institute of Biology.

Dyfyniad Arddull Chicago

Watson, Donald John, and W. B. Yapp. The Biological Productivity of Britain. London: Institute of Biology, 1958.

Dyfyniad MLA

Watson, Donald John, and W. B. Yapp. The Biological Productivity of Britain. Institute of Biology, 1958.

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