Dyfyniad APA

Preston, D. R., & Shuy, R. W. (1988). Varieties of American English: Teacher's handbook. Washington, DC.: Department of state.

Dyfyniad Arddull Chicago

Preston, Dennis R., và Roger W. Shuy. Varieties of American English: Teacher's Handbook. Washington, DC.: Department of state, 1988.

Dyfyniad MLA

Preston, Dennis R., và Roger W. Shuy. Varieties of American English: Teacher's Handbook. Washington, DC.: Department of state, 1988.

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