APA استشهاد

Krishan Kumar; Author. (1997). Theory of classification (Ed.4 rev.).

استشهاد بنمط شيكاغو

Krishan Kumar; Author. Theory of Classification. Ed.4 rev. New Delhi, Vikas Publishing, 1997.

MLA استشهاد

Krishan Kumar; Author. Theory of Classification. Ed.4 rev. 1997.