Harrell, T. (1964). Industrial Psychology (rev.). Oxford Book Co.
Lua i Stíl Chicago (17ú heag.)Harrell, T. Industrial Psychology. rev. Calcutta: Oxford Book Co, 1964.
Lua MLA (9ú heag.)Harrell, T. Industrial Psychology. rev. Oxford Book Co, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.