Παραπομπή APA

(1981). National waterways study: Waterways system and commodity movement maps. Ft Belvoir: Institute for Water Resources.

Παραπομπή Chicago Style

National Waterways Study: Waterways System and Commodity Movement Maps. Ft Belvoir: Institute for Water Resources, 1981.

Παραπομπή MLA

National Waterways Study: Waterways System and Commodity Movement Maps. Ft Belvoir: Institute for Water Resources, 1981.

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