Agung, Y. (2012). Yes! I can serve: Handbook for service excellence. Publishing One.
Čikaški stil citiranja (17. izdanje)Agung, Yuliana. Yes! I Can Serve: Handbook for Service Excellence. Publishing One, 2012.
MLA način citiranja (8. izdanje)Agung, Yuliana. Yes! I Can Serve: Handbook for Service Excellence. Publishing One, 2012.
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