Dyfyniad APA

O'Hair, D., & Friedrich, G. W. (1997). Competent communication (2nd ed.). St. Martin's.

Dyfyniad Arddull Chicago

O'Hair, Dan, and Gustav W. Friedrich. Competent Communication. 2nd ed. New York: St. Martin's, 1997.

Dyfyniad MLA

O'Hair, Dan, and Gustav W. Friedrich. Competent Communication. 2nd ed. St. Martin's, 1997.

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