Sehgal, R. (1993). Number building in Dewey Decimal Classification, Universal Decimal Classification, Colon Classification (1st.). Ess Ess.
Παραπομπή Chicago StyleSehgal, R.L. Number Building in Dewey Decimal Classification, Universal Decimal Classification, Colon Classification. 1st. New Delhi: Ess Ess, 1993.
Παραπομπή MLASehgal, R.L. Number Building in Dewey Decimal Classification, Universal Decimal Classification, Colon Classification. 1st. Ess Ess, 1993.
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