Παραπομπή APA

Dale Carnegie. (2011). How to develop self confidence and influence people by public speaking. Harmony books.

Παραπομπή Chicago Style

Dale Carnegie. How to Develop Self Confidence and Influence People by Public Speaking. Kozhikode: Harmony books, 2011.

Παραπομπή MLA

Dale Carnegie. How to Develop Self Confidence and Influence People by Public Speaking. Harmony books, 2011.