423378 Birchard, B. (2005). Natures keepers: The remarkable story of how the Nature Conservancy became the largest environmental organization in the world. San Francisco, CA : Jossey-Bass.
Chicago (17e ed.) Bronvermelding423378 Birchard, Bill. Natures Keepers: The Remarkable Story of How the Nature Conservancy Became the Largest Environmental Organization in the World. San Francisco, CA : Jossey-Bass, 2005.
MLA (9e ed.) Bronvermelding423378 Birchard, Bill. Natures Keepers: The Remarkable Story of How the Nature Conservancy Became the Largest Environmental Organization in the World. San Francisco, CA : Jossey-Bass, 2005.
Let op: Deze citaties zijn niet altijd 100% accuraat.