//-->
Salesmanship : principles and methods
Pederson, Carlton A., (1966)
The industrial salesman as a source of market information
Webster jr., Frederick E., (1965)
Interaction and influence processes in personal selling
Davis, Harry L., (1971)
Tips from a thousand salesmen : a collection of 250 messages to salesmen based on methods and plans used by salesmen in nearly all lines of business
Aspley, John Cameron, (1929)
The sales manager's handbook
Aspley, John Cameron, (1950)