Chang, R. (1998). Imprpving through bench marking. Wheeler.
Chicago-čujuhus (17. p.)Chang, Richard. Imprpving Through Bench Marking. New Delhi: Wheeler, 1998.
MLA-čujuhus (9. p.)Chang, Richard. Imprpving Through Bench Marking. Wheeler, 1998.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.