Greg W. Marshall, William C. Moncrief, and Felicia G. Lassk. The Current State of Sales Force Activities. Industrial Marketing Management 28 (1999). С. 87–98; William C. Moncrief, Selling Activity and Sales Position Taxonomies for Industrial Salesforces. Journal of Marketing research 23 (август 1986). С. 261–270; Robert E. Hite and Joseph A. Bellizzi. Differences in the Importance of Selling Techniques between Consumer and Industrial Salespeople. Journal of Personal Selling & Sales Management 5 (ноябрь 1985). С. 19–30.