Gaya APA

Secret of Successful Spekaers How You can Motivate, Captive, and Persuade. (1993). Mc Graw Hill: mc graw hill.

Gaya MLA

Secret of Successful Spekaers How You can Motivate, Captive, and Persuade. 1993. Mc Graw Hill: mc graw hill, 1993. Text.