Penrose, J. M. (2004). Business Communication for Managers (5th.). Cengage Learning.
Chicago Style aipamenaPenrose, John M. Business Communication for Managers. 5th. New Delhi: Cengage Learning, 2004.
MLA aipamenaPenrose, John M. Business Communication for Managers. 5th. Cengage Learning, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.