Παραπομπή σε μορφή APA (7η εκδ.)

Burrill, R. (1994). Protectors of the land: An environmental journey to understanding the conservation ethic. The Anthro Company.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Burrill, Richard. Protectors of the Land: An Environmental Journey to Understanding the Conservation Ethic. Sacramento, CA: The Anthro Company, 1994.

Παραπομπή σε μορφή MLA (8th εκδ.)

Burrill, Richard. Protectors of the Land: An Environmental Journey to Understanding the Conservation Ethic. The Anthro Company, 1994.