Carnegie, D. (1940). How to win friend and influences people (6ª ed.). Pocket Books.
Chicago-viite (17. p.)Carnegie, Dale. How to Win Friend and Influences People. 6ª ed. Pocket Books, 1940.
MLA-viite (9. p.)Carnegie, Dale. How to Win Friend and Influences People. 6ª ed. Pocket Books, 1940.
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