Dyfyniad APA

(1973). Prolems and prospects of the primary ... industry. Paris: OCED.

Dyfyniad Arddull Chicago

Prolems and Prospects of the Primary ... Industry. Paris: OCED, 1973.

Dyfyniad MLA

Prolems and Prospects of the Primary ... Industry. Paris: OCED, 1973.

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