Gaya APA

Schonberger, R, J., Knod, E, M, J. (1991). Operations Management, Improving Customer Service (Keempat). Boston: Irwin.

Gaya MLA

Schonberger, Richard, J.., Knod, Edward, M., Jr. "Operations Management, Improving Customer Service". Keempat Boston: Irwin, 1991. .