Yam, W. K. (1996). Customer Focus Among Education Service Officers in Perak.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रYam, Weng Kong. Customer Focus Among Education Service Officers in Perak. 1996.
एमएलए (9वां संस्करण) प्रशस्ति पत्रYam, Weng Kong. Customer Focus Among Education Service Officers in Perak. 1996.
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