Dyfyniad APA

(1963). The world book encyclopedia. Vol.20: Reading and study guide. Chicago: Field Enterprises Educational Corporation.

Dyfyniad Arddull Chicago

The World Book Encyclopedia. Vol.20: Reading and Study Guide. Chicago: Field Enterprises Educational Corporation, 1963.

Dyfyniad MLA

The World Book Encyclopedia. Vol.20: Reading and Study Guide. Chicago: Field Enterprises Educational Corporation, 1963.

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