Dyfyniad APA

(1972). Elementary science ; learning by investigating 1. Rand McNally & Co.

Dyfyniad Arddull Chicago

Elementary Science ; Learning by Investigating 1. Chicago: Rand McNally & Co, 1972.

Dyfyniad MLA

Elementary Science ; Learning by Investigating 1. Rand McNally & Co, 1972.

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