See also the home page of the Legenda book series Studies In Linguistics

Hornsby, David. 2006. Redefining Regional French: Koinéization and Dialect Levelling in Northern France, Studies In Linguistics, 3 (Legenda)

Ayres-Bennett, Wendy, and Mari C. Jones (eds). 2007. The French Language and Questions of Identity, Studies In Linguistics, 4 (Legenda)