Không rõ. (2010). Communication Systems. NOTNXB.
Chicago Style aipamenaKhông rõ. Communication Systems. NOTNXB, 2010.
MLA aipamenaKhông rõ. Communication Systems. NOTNXB, 2010.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.
Không rõ. (2010). Communication Systems. NOTNXB.
Chicago Style aipamenaKhông rõ. Communication Systems. NOTNXB, 2010.
MLA aipamenaKhông rõ. Communication Systems. NOTNXB, 2010.