Gaya APA

The Complete guide to environmental careers in the 21 st century / Kevin Doyle : Sam Heizmann : Tanya Stubbs. (1999). : Washington, DC : Island Press.

Gaya MLA

The Complete guide to environmental careers in the 21 st century / Kevin Doyle : Sam Heizmann : Tanya Stubbs. Edisi revisi. : Washington, DC : Island Press, 1999. Text.