Cita APA

Sehgal, R. L. (2004). Introduction to universal decimal classification. Ess Ess.

Citación estilo Chicago

Sehgal, R L. Introduction to Universal Decimal Classification. New Delhi: Ess Ess, 2004.

Cita MLA

Sehgal, R L. Introduction to Universal Decimal Classification. Ess Ess, 2004.