PARR WILLIAM M. (1984). EXCUTIVE`S GUIDE TO EFFECTIVE LETTERS & REPORTS. TARAPOREVALA PUBLICATIONS.
Chicago Style aipamenaPARR WILLIAM M. EXCUTIVE`S GUIDE TO EFFECTIVE LETTERS & REPORTS. BOMBAY: TARAPOREVALA PUBLICATIONS, 1984.
MLA aipamenaPARR WILLIAM M. EXCUTIVE`S GUIDE TO EFFECTIVE LETTERS & REPORTS. TARAPOREVALA PUBLICATIONS, 1984.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.