Dyfyniad APA

Allaby, M. (1996). Basics of environmental science. Routledge.

Dyfyniad Arddull Chicago

Allaby, Michael. Basics of Environmental Science. London: Routledge, 1996.

Dyfyniad MLA

Allaby, Michael. Basics of Environmental Science. Routledge, 1996.

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