Goldratt Eliyahu M. (2010). Isn't It Obvious. Productivity & Quality.
Lua i Stíl Chicago (17ú heag.)Goldratt Eliyahu M. Isn't It Obvious. Madras: Productivity & Quality, 2010.
Lua MLA (9ú heag.)Goldratt Eliyahu M. Isn't It Obvious. Productivity & Quality, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.