Jay Greene; Steve Hamm; Jim Kerstetter (17 ივნისი, 2002). „Ballmer's Microsoft“. BusinessWeek. ციტატა: „After two years, Ballmer headed for Stanford University's MBA program for a better grounding in business. When the fledgling Microsoft ran into problems in 1980, Gates persuaded his friend to drop out and give him a hand.“ შეამოწმეთ თარიღის პარამეტრი |date=-ში (დახმარება)
