Goldratt, E. (1993). The goal (2nd.). Productivity Press.
Lua i Stíl Chicago (17ú heag.)Goldratt, E. The Goal. 2nd. Madras: Productivity Press, 1993.
Lua MLA (9ú heag.)Goldratt, E. The Goal. 2nd. Productivity Press, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.