(1992). Marketing Berkowitz, Kerin Et.al. Richard D.Irwin.
Lua i Stíl Chicago (17ú heag.)Marketing Berkowitz, Kerin Et.al. Richard D.Irwin, 1992.
Lua MLA (8ú heag.)Marketing Berkowitz, Kerin Et.al. Richard D.Irwin, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.