Không rõ. (2008). Management People, Performance, Change. NOTNXB.
Chicago Style aipamenaKhông rõ. Management People, Performance, Change. NOTNXB, 2008.
MLA aipamenaKhông rõ. Management People, Performance, Change. NOTNXB, 2008.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.