Gaya APA

Vengel, A. (2010). 20 [Twenty] minutes to a top performer : three fast and effective conversations to motivate, develop, and engage your employees . New York: Mc Graw Hill.

Gaya MLA

Vengel, Alan. "20 [Twenty] minutes to a top performer : three fast and effective conversations to motivate, develop, and engage your employees". New York: Mc Graw Hill, 2010. Text.