American Management Association (AMA)
An international leader in management training and professional development for individuals, teams and entire organizations. Offers classes, seminars, workshops, books and other types of business educational courses that help professionals at all levels to learn new skills, achieve excellence, and advance in a complex and competitive world.
http://www.amanet.org/

EIPM
Official site of the european center for research education action training conference in purchasing and supply management MBA.
http://www.eipm.org/