Heine, Bernd and Kuteva, Tania. 2002. World Lexicon of Grammaticalization. 1st edn. Cambridge University Press.
https://www.cambridge.org/core/product/identifier/9780511613463/type/book
@book{magram-heineworld2002,
author = {Heine, Bernd and Kuteva, Tania},
edition = {1},
month = {March},
publisher = {Cambridge University Press},
title = {World Lexicon of Grammaticalization},
url = {https://www.cambridge.org/core/product/identifier/9780511613463/type/book},
year = {2002}
}