Kerala (India). Bureau of Economics and Statistics. Industrial Statistics Unit. Annual survey of industries, Kerala State. The Unit.
Chicago-referens (17:e uppl.)Kerala (India). Bureau of Economics and Statistics. Industrial Statistics Unit. Annual Survey of Industries, Kerala State. Trivandrum: The Unit.
MLA-referens (8:e uppl.)Kerala (India). Bureau of Economics and Statistics. Industrial Statistics Unit. Annual Survey of Industries, Kerala State. The Unit.
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