2 1 30 Walker, Orville C. Primary Author Churchill, Gilbert A. Primary Author Ford, Neil M. Primary Author mixed material 0256137870 Homewood Irwin 1997 sales+force+management+Churcill+5th.jpg planning and implementation Walker, Orville C. Primary Author Byod, Harper Primary Author Larreche, Jean-Claude Primary Author mixed material 0256112711 Homewood Irwin 1992 Marketing+strategy%2C+planning+and+implementation+--+Walker.jpg