1. New Selling Methods Are Changing Industrial Sales Management;Cardozo;Business Horizons,1987
2. Improving Mail Response Rates With Express Mail;Kallis;Industrial Marketing Management,1992
3. Handbook of Direct Mail. The Dialogue Method of Direct Written Sales Communication;Vögele,1992
4. The Effect of Direct Marketing on Insurance Agents' Sales;Cash;Journal of Direct Marketing,1987
5. Business-to-Business Direct Marketing;Goldberg,1990