Citazione APA

Khan, M. I., & Nigam, B. K. (1993). Social theory and educational systems.

Stile di citazione Chicago

Khan, M I., e B K. Nigam. Social Theory and Educational Systems. New Delhi, Kanishka Publishers, 1993.

Citazione MLA

Khan, M I., e B K. Nigam. Social Theory and Educational Systems. 1993.