Fontana, D. (1996). Managing time. Excel.
Chicago-čujuhus (17. p.)Fontana, David. Managing Time. New Delhi: Excel, 1996.
MLA-čujuhus (9. p.)Fontana, David. Managing Time. Excel, 1996.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.