Sackman, H. (1972). Online planning towards creative problem-solving. Prentice-Hall, Inc.
Cita Chicago (17th ed.)Sackman, Harold. Online Planning Towards Creative Problem-solving. Englewood Cliffs, N.J: Prentice-Hall, Inc, 1972.
Cita MLA (9th ed.)Sackman, Harold. Online Planning Towards Creative Problem-solving. Prentice-Hall, Inc, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.