Παραπομπή σε μορφή APA (7η εκδ.)

Marshall, R. J. (1968). A traffic simulation package using the opportunity model. New York State Department of Transportation, Subdivision of Transportation Planning and Programming.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Marshall, Ralph J. A Traffic Simulation Package Using the Opportunity Model. Albany, N.Y.: New York State Department of Transportation, Subdivision of Transportation Planning and Programming, 1968.

Παραπομπή σε μορφή MLA (8th εκδ.)

Marshall, Ralph J. A Traffic Simulation Package Using the Opportunity Model. New York State Department of Transportation, Subdivision of Transportation Planning and Programming, 1968.