The Illicit Antiquities Research Centre Its purpose is to monitor and report upon the detrimental effects of the international trade in illicit antiquities (i.e. antiquities which have been stolen or clandestinely excavated and illegally exported)

International Foundation for Art Research (IFAR) is a not-for-profit educational and research organization dedicated to integrity in the visual arts. IFAR offers impartial and authoritative information on authenticity, ownership, theft, and other artistic, legal, and ethical issues concerning art objects.

Interpol: Stolen Works of Art