Vengel, A. A. (2010). 20 minutes to a top performer: Three fast and effective conversations to motivate, develop, and engage your employees. Mcgraw-Hill.
Lua i Stíl Chicago (17ú heag.)Vengel, Alan A. 20 Minutes to a Top Performer: Three Fast and Effective Conversations to Motivate, Develop, and Engage Your Employees. New York , N.Y: Mcgraw-Hill, 2010.
Lua MLA (9ú heag.)Vengel, Alan A. 20 Minutes to a Top Performer: Three Fast and Effective Conversations to Motivate, Develop, and Engage Your Employees. Mcgraw-Hill, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.