Παραπομπή σε μορφή APA (7η εκδ.)

Libecap, G. D., & Smith, J. L. (1999). The self-enforcing provisions of oil and gas unit operating agreements: Theory and evidence. National Bureau of Economic Research.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Libecap, Gary D., και James L. Smith. The Self-enforcing Provisions of Oil and Gas Unit Operating Agreements: Theory and Evidence. Cambridge: National Bureau of Economic Research, 1999.

Παραπομπή σε μορφή MLA (9th εκδ.)

Libecap, Gary D., και James L. Smith. The Self-enforcing Provisions of Oil and Gas Unit Operating Agreements: Theory and Evidence. National Bureau of Economic Research, 1999.