APA (7 वां संस्करण) प्रशस्ति पत्र
Petre, M., & Rugg, G. (2010). The unwritten rules of PhD research (2nd ed.). Open University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Petre, Marian, और Gordon Rugg. The Unwritten Rules of PhD Research. 2nd ed. Maidenhead, England: Open University Press, 2010.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Petre, Marian, और Gordon Rugg. The Unwritten Rules of PhD Research. 2nd ed. Open University Press, 2010.
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