(1992). International Business / Betty Jane Punnet, David A. Ricks. PWS-Kent.
Lua i Stíl Chicago (17ú heag.)International Business / Betty Jane Punnet, David A. Ricks. PWS-Kent, 1992.
Lua MLA (8ú heag.)International Business / Betty Jane Punnet, David A. Ricks. PWS-Kent, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.