Dyfyniad APA

(1982). World English: Teacher's book. Washington, DC.: United states Department of state.

Dyfyniad Arddull Chicago

World English: Teacher's Book. Washington, DC.: United states Department of state, 1982.

Dyfyniad MLA

World English: Teacher's Book. Washington, DC.: United states Department of state, 1982.

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