Supersellers : portraits of success from Personal selling power / Gerhard Gschwandtner and Laura B. Gschwandtner. Personal selling power. Gschwandtner, Gerhard. Gschwandtner, Laura B. Selling Case studies. Success in business United States Case studies. 658.85 GSS New York, N.Y. : Amacom, c1986. c1986. 1986 Text xi, 169 p. : eng United States