Παραπομπή APA

Asthana, S. (1991). Environment resource planning 200 6 AD.

Παραπομπή Chicago Style

Asthana, S.P. Environment Resource Planning 200 6 AD. :, 1991.

Παραπομπή MLA

Asthana, S.P. Environment Resource Planning 200 6 AD. 1991.