Vieira, W. (2008). The new professional salesman: Meeting challenges in the 21st century. Response Books.
Styl ChicagoVieira, Walter. The New Professional Salesman: Meeting Challenges in the 21st Century. New Delhi: Response Books, 2008.
Citace podle MLAVieira, Walter. The New Professional Salesman: Meeting Challenges in the 21st Century. Response Books, 2008.
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