http://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?assetId=113164001&objectId=368104&partId=1 http://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?objectId=368103&partId=1 https://encyclopedieberbere.revues.org/2125#tocfrom1n1
RIL 1
Poinssot, Salomonson 1959
Ghaki 1997, 27-28
Casajus 2013 (https://afriques.revues.org/1203)