Johnston Robert. (2008). Service Operations Management (2nd.). Pearson.
Chicago Style aipamenaJohnston Robert. Service Operations Management. 2nd. Noida: Pearson, 2008.
MLA aipamenaJohnston Robert. Service Operations Management. 2nd. Pearson, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.