Powers, B. (1992). Instructor excellence: Mastering the delivery of training. Jossey Bass.
Lua i Stíl Chicago (17ú heag.)Powers, Bob. Instructor Excellence: Mastering the Delivery of Training. San Francisco: Jossey Bass, 1992.
Lua MLA (9ú heag.)Powers, Bob. Instructor Excellence: Mastering the Delivery of Training. Jossey Bass, 1992.
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