COTTAM ANGELA. (1999). MANAGEMENT AND MARKETING OF SERVICES (2ND.). BUTTERWORTH-HEINEMANN.
Chicago Style aipamenaCOTTAM ANGELA. MANAGEMENT AND MARKETING OF SERVICES. 2ND. LONDON: BUTTERWORTH-HEINEMANN, 1999.
MLA aipamenaCOTTAM ANGELA. MANAGEMENT AND MARKETING OF SERVICES. 2ND. BUTTERWORTH-HEINEMANN, 1999.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.