BARRETT, C. (1987). Practical Handbook Of Transportation Contracting And Rate Negotiation Collin Barrett. The Traffic Service Corporatio.
Lua i Stíl Chicago (17ú heag.)BARRETT, Colin. Practical Handbook Of Transportation Contracting And Rate Negotiation Collin Barrett. The Traffic Service Corporatio, 1987.
Lua MLA (8ú heag.)BARRETT, Colin. Practical Handbook Of Transportation Contracting And Rate Negotiation Collin Barrett. The Traffic Service Corporatio, 1987.
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