Cita APA

Whiting, P. H. (1964). Five great problems of salesmen and how to solve them. McGraw Hill.

Chicago Edition Citation

Whiting, Percy H. Five Great Problems of Salesmen and How to Solve Them. New York: McGraw Hill, 1964.

Cita MLA

Whiting, Percy H. Five Great Problems of Salesmen and How to Solve Them. McGraw Hill, 1964.