APA način citiranja (7. izdanje)

Nelson, J. How to write impressive business letters. Goodwill Pub..

Čikaški stil citiranja (17. izdanje)

Nelson, Jens. How to Write Impressive Business Letters. New Delhi: Goodwill Pub..

MLA način citiranja (8. izdanje)

Nelson, Jens. How to Write Impressive Business Letters. Goodwill Pub..