DUGGER, J. (1992). Business Letter For Busy People Jim Dugger. Golden Books Centre.
Čikaški stil citiranja (17. izdanje)DUGGER, Jim. Business Letter For Busy People Jim Dugger. Golden Books Centre, 1992.
MLA način citiranja (8. izdanje)DUGGER, Jim. Business Letter For Busy People Jim Dugger. Golden Books Centre, 1992.
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