Dale Breckenridge Carnegie was an American writer and speaker. He wrote best-sellers How to Win Friends and Influence People (1936) and How to Stop Worrying and Start Living. Thanks to his success, he became a world leader and wrote columns in several newspapers and had his own radio program. He founded what is now a worldwide network of more than 2,700 instructors and offices in approximately 90 countries around the world. Although it is a book with inspiring principles, many scholars do not consider it a solid work because it lacks sources of research in its bibliography, being understood then as a book of "self-help" as inspiration, because to be considered a scientific book, sources would be needed and especially a research paper, which is not presented in the book.
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