Dyfyniad APA

National productivity council. (1963). Productivity. NPC Publication.

Dyfyniad Arddull Chicago

National productivity council. Productivity. NPC Publication, 1963.

Dyfyniad MLA

National productivity council. Productivity. NPC Publication, 1963.

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