BARRETT, C. (1987). Practical Handbook Of Transportation Contracting And Rate Negotiation Collin Barrett. The Traffic Service Corporatio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBARRETT, Colin. Practical Handbook Of Transportation Contracting And Rate Negotiation Collin Barrett. The Traffic Service Corporatio, 1987.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBARRETT, Colin. Practical Handbook Of Transportation Contracting And Rate Negotiation Collin Barrett. The Traffic Service Corporatio, 1987.
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