Castillon, D. A. (1996). Conservation of natural resources: A resource management approach (2nd ed.). Brown & Benchmark Publishers.
Chicago-referens (17:e uppl.)Castillon, David A. Conservation of Natural Resources: A Resource Management Approach. 2nd ed. Madison, Wis: Brown & Benchmark Publishers, 1996.
MLA-referens (9:e uppl.)Castillon, David A. Conservation of Natural Resources: A Resource Management Approach. 2nd ed. Brown & Benchmark Publishers, 1996.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.