Sheppard, S. E., & Carroll, D. C. (1980). Working in the twenty-first century. John Wiley and Sons.
Chicago-čujuhus (17. p.)Sheppard, Stewart E., juo Donal C. Carroll. Working in the Twenty-first Century. John Wiley and Sons, 1980.
MLA-čujuhus (9. p.)Sheppard, Stewart E., juo Donal C. Carroll. Working in the Twenty-first Century. John Wiley and Sons, 1980.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.