Dyfyniad APA

(1967). Vanguarn, scott, foressman and company.

Dyfyniad Arddull Chicago

Vanguarn, Scott, Foressman and Company. 1967.

Dyfyniad MLA

Vanguarn, Scott, Foressman and Company. 1967.

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