Sheppard, S. E., & Carroll, D. C. (1980). Working in the twenty-first century. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)Sheppard, Stewart E., agus Donal C. Carroll. Working in the Twenty-first Century. John Wiley and Sons, 1980.
Lua MLA (9ú heag.)Sheppard, Stewart E., agus Donal C. Carroll. Working in the Twenty-first Century. John Wiley and Sons, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.