Grefen, P. Mastering e-business.
Lua i Stíl Chicago (17ú heag.)Grefen, Paul. Mastering E-business.
Lua MLA (8ú heag.)Grefen, Paul. Mastering E-business.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)