Sagara, Keiko.
Numeral Systems in sign languages across the world. - Osaka-JP : National Museum Ethnology, 2014. - páginas 5-7 : ilustraciones blanco y negro - Irregular - No. 39 (Dic. 2014) - Minpaku Anthoropology Newsletter ; no. 39 . - National Museum of Ethnology Osaka. .
Numeral Systems in sign languages across the world. - Osaka-JP : National Museum Ethnology, 2014. - páginas 5-7 : ilustraciones blanco y negro - Irregular - No. 39 (Dic. 2014) - Minpaku Anthoropology Newsletter ; no. 39 . - National Museum of Ethnology Osaka. .