APA (7 वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, & Graaff, J. d. (2007). Monitoring and evaluation of soil conservation and watershed development projects. Science Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, और J. de Graaff. Monitoring and Evaluation of Soil Conservation and Watershed Development Projects. Enfield, NH: Science Publishers, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, और J. de Graaff. Monitoring and Evaluation of Soil Conservation and Watershed Development Projects. Science Publishers, 2007.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.