Porter-Roth. (2002). Request for proposal: A guide to effective RFP development. Addison-Wesley.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPorter-Roth. Request for Proposal: A Guide to Effective RFP Development. Boston,MA: Addison-Wesley, 2002.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPorter-Roth. Request for Proposal: A Guide to Effective RFP Development. Addison-Wesley, 2002.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.