Sehgal, R. (1993). Number Building in Dewey Decimal Classification,Universal Decimal Classification,Colon Classification. Ess Ess Publications.
শিকাগো স্টাইলে সাইটেশনSehgal, R.L. Number Building in Dewey Decimal Classification,Universal Decimal Classification,Colon Classification. New Delhi: Ess Ess Publications, 1993.
এমএলএ সাইটেশনSehgal, R.L. Number Building in Dewey Decimal Classification,Universal Decimal Classification,Colon Classification. Ess Ess Publications, 1993.
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