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World Lexicon of Grammaticalization. by: Heine, Bernd.; Ebooks Corporation.; Kuteva, Tania. (Electronic resources)

Language Contact and Grammatical Change. by: Milroy, Lesley.; Heine, Bernd.; Chaudenson, Robert.; Kachru, Braj.; Silverstein, Michael.; Poplack, Shana.; Mufwene, Salikoko S.; Kuteva, Tania.; Ebooks Corporation. (Electronic resources)