1. Abrashoff, D. Michael. “Retention through redemption.” Harvard Business Review 79, no. 2 (2001): 136–41, 158.
2. Ackoff, Russell L. “Science in the systems age: Beyond IE, OR, and MS.” Operations Research 21, no. 3 (1973): 661–71.
3. Akhter, Syed H. “Strategic planning, hypercompetition, and knowledge management.” Marketing Faculty Research and Publications, 2003, 6.
4. Babcock, George De Albert. The Taylor system in Franklin management: Application and results. Engineering Magazine Company, 1917.
5. Barnard, Chester Irving. The functions of the executive. Vol. 11. Harvard university press, 1968.