APA استشهاد

Vieira, W. (2008). The new professional salesman: Meeting challenges in the 21st century. Response Books.

استشهاد بنمط شيكاغو

Vieira, Walter. The New Professional Salesman: Meeting Challenges in the 21st Century. New Delhi: Response Books, 2008.

MLA استشهاد

Vieira, Walter. The New Professional Salesman: Meeting Challenges in the 21st Century. Response Books, 2008.