Gentle Michael. (2002). CRM Project Management Handbook: Building realistic expectations and managing risk. Kongan Page Ltd.
Lua i Stíl Chicago (17ú heag.)Gentle Michael. CRM Project Management Handbook: Building Realistic Expectations and Managing Risk. London: Kongan Page Ltd, 2002.
Lua MLA (9ú heag.)Gentle Michael. CRM Project Management Handbook: Building Realistic Expectations and Managing Risk. Kongan Page Ltd, 2002.
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