Dyfyniad APA

Levin, P. (2007). Skilful time management! Open University Press.

Dyfyniad Arddull Chicago

Levin, Peter. Skilful Time Management! Maidenhead, England ; New York: Open University Press, 2007.

Dyfyniad MLA

Levin, Peter. Skilful Time Management! Open University Press, 2007.

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