Παραπομπή σε μορφή APA (7η εκδ.)

Levy, W., & Hallowell, C. (1994). Green perspectives: Thinking and writing about nature and the environment. HarperCollins College Publishers.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Levy, Walter, και Christopher Hallowell. Green Perspectives: Thinking and Writing About Nature and the Environment. New York: HarperCollins College Publishers, 1994.

Παραπομπή σε μορφή MLA (9th εκδ.)

Levy, Walter, και Christopher Hallowell. Green Perspectives: Thinking and Writing About Nature and the Environment. HarperCollins College Publishers, 1994.