Dyfyniad APA

Holechek, J., .fisher, j. t., & .cole, r. a. (2000). Natural resources: Ecology, economics, and policy. Prentice Hall.

Dyfyniad Arddull Chicago

Holechek, Jerry, james t. .fisher, and richard a. .cole. Natural Resources: Ecology, Economics, and Policy. Upper Saddle River, NJ: Prentice Hall, 2000.

Dyfyniad MLA

Holechek, Jerry, et al. Natural Resources: Ecology, Economics, and Policy. Prentice Hall, 2000.

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