APA aipamena

Agarwal, S. K., & Ansari, M. M. (1991). Directory of distance education institutions.

Chicago Style aipamena

Agarwal, S K., and M M. Ansari. Directory of Distance Education Institutions. New Delhi, Association of Indian Universities, 1991.

MLA aipamena

Agarwal, S K., and M M. Ansari. Directory of Distance Education Institutions. 1991.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.