Dyfyniad APA

Verderber, R. F., & Sellnow, D. D. (2008). Effective speaking. Belmont, CA: Thomson/Wadsworth.

Dyfyniad Arddull Chicago

Verderber, Rudolph F., và Deanna D. Sellnow. Effective Speaking. Belmont, CA: Thomson/Wadsworth, 2008.

Dyfyniad MLA

Verderber, Rudolph F., và Deanna D. Sellnow. Effective Speaking. Belmont, CA: Thomson/Wadsworth, 2008.

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