Knowles, R. (2005). 150 contractual problems and their solutions (2nd ed.). Blackwell.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKnowles, Roger. 150 Contractual Problems and Their Solutions. 2nd ed. Oxford: Blackwell, 2005.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKnowles, Roger. 150 Contractual Problems and Their Solutions. 2nd ed. Blackwell, 2005.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.