HARPER JOHN. (2000). CHAIRING THE BOARD. KOGAN PAGE.
Chicago Style aipamenaHARPER JOHN. CHAIRING THE BOARD. LONDON: KOGAN PAGE, 2000.
MLA aipamenaHARPER JOHN. CHAIRING THE BOARD. KOGAN PAGE, 2000.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.