Singapore. Dept. of Statistics. (1980). Singapore standard occupational classification, 1978. Dept. of Statistics.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSingapore. Dept. of Statistics. Singapore Standard Occupational Classification, 1978. Singapore: Dept. of Statistics, 1980.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSingapore. Dept. of Statistics. Singapore Standard Occupational Classification, 1978. Dept. of Statistics, 1980.
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