Vintage Veterinary Medicine And Human Health Third Edition By Calvin E. Schwabe
You will find that this textbook covers all the core material you need for the course.
Management by James A. F. Stoner & R. Edward Freeman 1992 5th Ed. Prentice-Hall
You will find that this textbook uses simple language without dumbing things down.
Decision Support & Expert Systems: Management Support Systems 3rd Ed Turban
A nice touch in this textbook is the list of key people and their contributions.