Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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