Revista Mexicana de Sociología, R. 1971. "Notes concerning a Language-Nation Typology", en Language Problems of Developing Nations by Heinz Kloss, J. A. Fishman, C. A. Ferguson, J. Das Gupta. Revista Mexicana de Sociologí­a. 33, 1 (Jan. 1971), 238–239. DOI:https://doi.org/10.22201/iis.01882503p.1971.1.58265.