National Safe Transit Association. Clearwater Beach, Florida, & National Safe Transit Association. (1990). High yield packaging: Proceedings NSTA '90. National Safe Transit Association.
Lua i Stíl Chicago (17ú heag.)National Safe Transit Association. Clearwater Beach, Florida, agus National Safe Transit Association. High Yield Packaging: Proceedings NSTA '90. Chicago, Ill.: National Safe Transit Association, 1990.
Lua MLA (8ú heag.)National Safe Transit Association. Clearwater Beach, Florida, agus National Safe Transit Association. High Yield Packaging: Proceedings NSTA '90. National Safe Transit Association, 1990.
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