Petre, M., & Rugg, G. (2010). The unwritten rules of PhD research (2nd ed.). Open University Press.

Petre, Marian, and Gordon Rugg. The Unwritten Rules of PhD Research. 2nd ed. Maidenhead, England: Open University Press, 2010.

Petre, Marian, and Gordon Rugg. The Unwritten Rules of PhD Research. 2nd ed. Open University Press, 2010.