Dyfyniad APA

Tank, R. (1973). Focus on environmental geology. Oxford University.

Dyfyniad Arddull Chicago

Tank, Ronald. Focus on Environmental Geology. Oxford: Oxford University, 1973.

Dyfyniad MLA

Tank, Ronald. Focus on Environmental Geology. Oxford University, 1973.

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