Sherfield Robert M. Cornerstone Developing Soft Skills (4th.). Pearson.
Čikaški stil citiranja (17. izdanje)Sherfield Robert M. Cornerstone Developing Soft Skills. 4th. Delhi Delhi: Pearson.
MLA način citiranja (9. izdanje)Sherfield Robert M. Cornerstone Developing Soft Skills. 4th. Pearson.
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