Holechek, J., .fisher, j. t., & .cole, r. a. (2000). Natural resources: Ecology, economics, and policy. Prentice Hall.
Παραπομπή σε μορφή Chicago (17η εκδ.)Holechek, Jerry, james t. .fisher, και richard a. .cole. Natural Resources: Ecology, Economics, and Policy. Upper Saddle River, NJ: Prentice Hall, 2000.
Παραπομπή σε μορφή MLA (9th εκδ.)Holechek, Jerry, et al. Natural Resources: Ecology, Economics, and Policy. Prentice Hall, 2000.