Παραπομπή σε μορφή APA (7η εκδ.)

Hartwick, J. M. (1989). Non-renewable resources: Extraction programs and markets. Harwood Academic Publishers.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hartwick, John M. Non-renewable Resources: Extraction Programs and Markets. London: Harwood Academic Publishers, 1989.

Παραπομπή σε μορφή MLA (9th εκδ.)

Hartwick, John M. Non-renewable Resources: Extraction Programs and Markets. Harwood Academic Publishers, 1989.