Brelin, H. K. D. (1995). Focused Quality.
Chicago-čujuhus (17. p.)Brelin, Harvey K; Davenport. Focused Quality. 1995.
MLA-čujuhus (9. p.)Brelin, Harvey K; Davenport. Focused Quality. 1995.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.