Dyfyniad APA

(1973). PHYSICAL SCIENCE. v1. Introduction and guide. V2. Teachers guide ii. Penguin.

Dyfyniad Arddull Chicago

PHYSICAL SCIENCE. V1. Introduction and Guide. V2. Teachers Guide Ii. England: Penguin, 1973.

Dyfyniad MLA

PHYSICAL SCIENCE. V1. Introduction and Guide. V2. Teachers Guide Ii. Penguin, 1973.

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