Heine, Bernd and Kuteva, Tania. 2002. World Lexicon of Grammaticalization. Cambridge: Cambridge University Press.
@book{Heine-and-Kuteva-2002, address = {Cambridge}, author = {Heine, Bernd and Kuteva, Tania}, publisher = {Cambridge University Press}, title = {World Lexicon of Grammaticalization}, year = {2002} }