Mager, R. F. (1972). Goal analysis. Lear Siegler/Feron Pubolishers.
Lua i Stíl Chicago (17ú heag.)Mager, Robert F. Goal Analysis. Belmont: Lear Siegler/Feron Pubolishers, 1972.
Lua MLA (9ú heag.)Mager, Robert F. Goal Analysis. Lear Siegler/Feron Pubolishers, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.