PARKINSON C NORTHCOTE. (1989). 109 WAYS OF GETTING TO THE TOP: IDEAS OF THE WORLDS. VISION BOOKS PVT. LTD.
Chicago Style aipamenaPARKINSON C NORTHCOTE. 109 WAYS OF GETTING TO THE TOP: IDEAS OF THE WORLDS. NEW DELHI BOMBAY: VISION BOOKS PVT. LTD, 1989.
MLA aipamenaPARKINSON C NORTHCOTE. 109 WAYS OF GETTING TO THE TOP: IDEAS OF THE WORLDS. VISION BOOKS PVT. LTD, 1989.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.