Singapore. National Statistical Commission. (1973). Singapore standard industrial classification, 1973. National Statistical Commission.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSingapore. National Statistical Commission. Singapore Standard Industrial Classification, 1973. Singapore: National Statistical Commission, 1973.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSingapore. National Statistical Commission. Singapore Standard Industrial Classification, 1973. National Statistical Commission, 1973.
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