APA-ийн эшлэл(7 дахь хэвлэлт)

Scales, P. (2011). Continuing professional development in the lifelong learning sector. Open University Press.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Scales, Peter. Continuing Professional Development in the Lifelong Learning Sector. Berkshire, England: Open University Press, 2011.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Scales, Peter. Continuing Professional Development in the Lifelong Learning Sector. Open University Press, 2011.