Agung, Y. (2012). Yes! I can serve: Handbook for service excellence. Publishing One.
Lua i Stíl Chicago (17ú heag.)Agung, Yuliana. Yes! I Can Serve: Handbook for Service Excellence. Publishing One, 2012.
Lua MLA (8ú heag.)Agung, Yuliana. Yes! I Can Serve: Handbook for Service Excellence. Publishing One, 2012.
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