Traina, Antonino (1868) “rizzu”, inNuovo vocabolario Siciliano-Italiano [New Sicilian-Italian vocabulary] (in Italian), Liber Liber, published2020,page3497
AIS:Sprach- und Sachatlas Italiens und der Südschweiz [Linguistic and Ethnographic Atlas of Italy and Southern Switzerland] –map 1292: “il riccio” – onnavigais-web.pd.istc.cnr.it