Greenberg, P. (2010). CRM At the Speed of Light (4th.). TMH.
Lua i Stíl Chicago (17ú heag.)Greenberg, Paul. CRM At the Speed of Light. 4th. TMH, 2010.
Lua MLA (9ú heag.)Greenberg, Paul. CRM At the Speed of Light. 4th. TMH, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.