Dyfyniad APA

(1976). Birla Institute of scientific Research economic research Division.

Dyfyniad Arddull Chicago

Birla Institute of Scientific Research Economic Research Division. New delhi, 1976.

Dyfyniad MLA

Birla Institute of Scientific Research Economic Research Division. 1976.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.