APA-viite (7. p.)
Whapples, D. (2015). Continual service improvement manager: Careers in IT service management. BCS.
Chicago-viite (17. p.)
Whapples, David. Continual Service Improvement Manager: Careers in IT Service Management. Wiltshire, England: BCS, 2015.
MLA-viite (9. p.)
Whapples, David. Continual Service Improvement Manager: Careers in IT Service Management. BCS, 2015.
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