SEVI. 371/1579: Briefwisseling Toon Colpaert april 1991-december 1991.
Chicago Style aipamenaSEVI. 371/1579: Briefwisseling Toon Colpaert April 1991-december 1991.
MLA aipamenaSEVI. 371/1579: Briefwisseling Toon Colpaert April 1991-december 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.