Dyfyniad APA

Cheronis, N. D. The study of the physical world. [Boston],1958: Houghton Mifflin.

Dyfyniad Arddull Chicago

Cheronis, Nicholas D. The Study of the Physical World. [Boston],1958: Houghton Mifflin.

Dyfyniad MLA

Cheronis, Nicholas D. The Study of the Physical World. [Boston],1958: Houghton Mifflin.

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