Lua APA (7ú heag.)
Skills, S. (2001). Effective call centre training. Excel Books.
Lua i Stíl Chicago (17ú heag.)
Skills, Soft. Effective Call Centre Training. New Delhi: Excel Books, 2001.
Lua MLA (9ú heag.)
Skills, Soft. Effective Call Centre Training. Excel Books, 2001.
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