Den Neufirlle, R. (1990). Applied Systems Analysis Engineering Planning And Technology Management Richard De Neufirlle. McGraw-Hill.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDen Neufirlle, Richard. Applied Systems Analysis Engineering Planning And Technology Management Richard De Neufirlle. McGraw-Hill, 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDen Neufirlle, Richard. Applied Systems Analysis Engineering Planning And Technology Management Richard De Neufirlle. McGraw-Hill, 1990.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.