Παραπομπή APA

Sardana, J. L., & Sehgal, R. L. (1983). Universal decimal classification: Structure and methodology. Ess Ess Pub..

Παραπομπή Chicago Style

Sardana, J. L., και R. L. Sehgal. Universal Decimal Classification: Structure and Methodology. New Delhi: Ess Ess Pub., 1983.

Παραπομπή MLA

Sardana, J. L., και R. L. Sehgal. Universal Decimal Classification: Structure and Methodology. Ess Ess Pub., 1983.