(1965). Work study. Sawell Publications.
Chicago-čujuhus (17. p.)Work Study. London: Sawell Publications, 1965.
MLA-čujuhus (9. p.)Work Study. Sawell Publications, 1965.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.