Zangwill, W. I. (1981). Pathways to solutions, fixed points, and equilibria. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Zangwill, Willard I. Pathways to Solutions, Fixed Points, and Equilibria. Englewood Cliffs, N.J: Prentice-Hall, 1981.
Lua MLA (9ú heag.)Zangwill, Willard I. Pathways to Solutions, Fixed Points, and Equilibria. Prentice-Hall, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.