Zangwill, W., & Garcia, C. (1981). Pathways to solutions, fixed points, and eqilibria. Prentice-Hall.
Cita Chicago (17th ed.)Zangwill, W.I, i C.B Garcia. Pathways to Solutions, Fixed Points, and Eqilibria. Englewood Cliffs, N.J: Prentice-Hall, 1981.
Cita MLA (9th ed.)Zangwill, W.I, i C.B Garcia. Pathways to Solutions, Fixed Points, and Eqilibria. Prentice-Hall, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.