P3M3 – Portfolio Model. v2.1. Office of Government Commerce.[1]Arkivert 19. november 2010 hos Wayback Machine.
Portfolio, Programme and Project Management Maturity Model (P3M3): Introduction and Guide to P3M3. v2.1. Office of Government Commerce.[2]Arkivert 17. mars 2011 hos Wayback Machine.
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P3M3 – Portfolio Model. v2.1. Office of Government Commerce.[1]Arkivert 19. november 2010 hos Wayback Machine.
Portfolio, Programme and Project Management Maturity Model (P3M3): Introduction and Guide to P3M3. v2.1. Office of Government Commerce.[2]Arkivert 17. mars 2011 hos Wayback Machine.