Johnsson, H. (1990). Professional communications--for a change. Prentice Hall.
Chicago Style aipamenaJohnsson, Hans. Professional Communications--for a Change. New York: Prentice Hall, 1990.
MLA aipamenaJohnsson, Hans. Professional Communications--for a Change. Prentice Hall, 1990.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.