Baker, Colin (1992). Attituded and language, Clevedon, England: Multilingual Matters.
Breton, Roland J-L. (1991). Geolinguistics. Ottawa: University of Ottawa Press.
Fisman, Joshua A. (1974) Language planning and language planning research: The state of the art. In Fisman, J. A. (ed.), Advances in language planning. The Hague: Mouton. 15–33.
Haugen, Einar (1966). Dialect, language, nation, American Anthropologist 68:922–35.
Williams, Colin H. (1988). Introduction to geolinguistics. In Williams, C. H. (ed.), Language and geographic context. Clevedon, England: Multilingual Matters. 1–19.