DUGGER, J. (1992). Business Letter For Busy People Jim Dugger. Golden Books Centre.
Lua i Stíl Chicago (17ú heag.)DUGGER, Jim. Business Letter For Busy People Jim Dugger. Golden Books Centre, 1992.
Lua MLA (8ú heag.)DUGGER, Jim. Business Letter For Busy People Jim Dugger. Golden Books Centre, 1992.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.