Bernard Cerquiglini, The Languages of France, Report to the Minister of National Education, Research and Technology, and the Minister of Culture and Communication, April 1999
Auger, Julie (14–17 February 2003). Issues of authenticity, purity, and autonomy in minority languages: What is 'real' Picard, and who is an 'authentic' speaker?. Congress Minority and Diasporic Languages of Europe. Berkeley, US: Indiana University. in Nowak, Pawel; Yoquelet, Corey (eds.). Berkeley Linguistics Society (BLS 29). * - in France: c. 500 000 speakers [fr][1] - in Belgium: a rough approximation is about 12% to 15% of people in province of Hainaut, i.e. c. 150 000 to 200 000 speakers.