Whiting, P. H. (1964). Five great problems of salesmen and how to solve them. McGraw Hill.
Styl ChicagoWhiting, Percy H. Five Great Problems of Salesmen and How to Solve Them. New York: McGraw Hill, 1964.
Citace podle MLAWhiting, Percy H. Five Great Problems of Salesmen and How to Solve Them. McGraw Hill, 1964.
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