Loukotka proposed a classification for the languages of South America based on several previous works. This classification contained a lot of unpublished material and was therefore superior to all previous classifications. He divided the languages of South America and the Caribbean into 77 different families, based upon similarities of vocabulary and available lists. His classification of 1985 is the most influential and was based upon two previous schemes (1935, 1944), which were similar to those proposed by Paul Rivet, although the number of families was increased to 94 and 114.
- "KDO BYL KDO Čeští a slovenští orientalisté, afrikanisté a iberoamerikanisté / Who was who" (in Czech). Retrieved 11 March 2013.
- Rivet, Paul; Loukotka, Čestmír; Stresser-Pean, Guy (1952). "Langues de l'Amérique du Sud et des Antilles". In Antoine, Meillet; Cohen, Marcel. Les langues du monde (in French) (Second ed.) (Paris: Champion). pp. 1009–1160.
- Loukotka, Čestmír (1968). "Classification of South American Indian Languages". In Wilbert, Johannes. Reference Series vol 7. Reviewed by Robert L Carneiro in American Anthropologist Volume 72, Issue 3, 1970 (Los Angeles: Latin American Center, University of California). ASIN B0006EQ6MG. ISBN 9780879031077. Retrieved 11 March 2013. "453 pp, map, tables, bibliography, ethnolinguistic index, author index"
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