Gaya APA

Schonberger, R, J., Knod, E, M, J. (1991). Operations Management, Improving Customer Service (Fourth Edition). Boston: Richard D. Irwin, Inc.

Gaya MLA

Schonberger, Richard, J.., Knod, Edward, M., Jr. "Operations Management, Improving Customer Service". Fourth Edition Boston: Richard D. Irwin, Inc, 1991. .