Castillon, D. A. (1992). Conservation of natural resources: A resource management approach. Wm. C. Brown Publishers.
Lua i Stíl Chicago (17ú heag.)Castillon, David A. Conservation of Natural Resources: A Resource Management Approach. Dubuque, Iowa: Wm. C. Brown Publishers, 1992.
Lua MLA (9ú heag.)Castillon, David A. Conservation of Natural Resources: A Resource Management Approach. Wm. C. Brown Publishers, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.