Marshall, R. J. (1968). A traffic simulation package using the opportunity model. New York State Department of Transportation, Subdivision of Transportation Planning and Programming.
Lua i Stíl Chicago (17ú heag.)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.
Lua MLA (8ú heag.)Marshall, Ralph J. A Traffic Simulation Package Using the Opportunity Model. New York State Department of Transportation, Subdivision of Transportation Planning and Programming, 1968.
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