MLA

Chiras, Daniel D., and John P Reganold. Natural Resource Conservation : Management for a Sustainable Future. 9th ed. Upper Saddle River: Pearson, 2005.

APA

Chiras, D. D., & Reganold, J. P. (2005). Natural resource conservation : management for a sustainable future. 9th ed. Upper Saddle River: Pearson.

Chicago

Chiras, Daniel D., and John P. Reganold. Natural Resource Conservation: Management for a Sustainable Future. 9th ed. Upper Saddle River: Pearson, 2005.