Franklin Evans. Selling as a Dyadic Relationship – A New Approach. American Behavioral Scientist (май 1963). С. 76–79; Sean Dwyer, Orlando Richard, and C. David Shepherd. An Exploratory Study of Gender and Age Matching in the Salesperson-Prospective Customer Dyad: Testing Similarity-Performance Predictions. Journal of Personal Selling & Sales Management 18 (осень 1998). С. 55–69.