APA (7 वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, Powell, S., & Green, H. (2007). The doctorate worldwide. Society for Research into Higher Education & Open University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, Stuart Powell, और Howard Green. The Doctorate Worldwide. Maidenhead: Society for Research into Higher Education & Open University Press, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, et al. The Doctorate Worldwide. Society for Research into Higher Education & Open University Press, 2007.
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