Тот же источник, с. 38; Christen P. Heide. Dartnell’s 30th Sales Force Compensation Survery. Chicago: Dartnell Corp., 1999. С. 142.
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Kathleen McLaughlin. Training’s Top 50 Edward Jones. Training (март 2001). С. 20.
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H. Robert Dodge. Field Sales Management. Dallas: Business Publications, Inc., 1973. С. 226.
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Erika Rasmusson. Training Goes Virtual, Sales & Marketing Management (September 2000). С. 48: John Boe, Time Is Money. The American Salesman 54 (январь 2009). С. 3–5.