Dyfyniad APA

White, R. (1981). Introduction to the principles and practice of soil science. Blackwell.

Dyfyniad Arddull Chicago

White, R.E. Introduction to the Principles and Practice of Soil Science. London: Blackwell, 1981.

Dyfyniad MLA

White, R.E. Introduction to the Principles and Practice of Soil Science. Blackwell, 1981.

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