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Language contact and grammatical change. Cambridge University Press, 2005 (Co-authored by
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The changing languages of Europe. Oxford University Press, 2006 (Co-authored by
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The genesis of grammar: a reconstruction. Oxford University Press, 2007 (Co-authored by
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A linguistic geography of Africa. Cambridge University Press, 2008 (Co-edited by Derek Nurse). •
The Oxford handbook of linguistic analysis. Oxford University Press, 2010 (Co-edited by Heiko Narrog). •
Grammaticalization from a typological perspective. Oxford University Press, 2019 (Co-edited by Heiko Narrog) •
World lexicon of grammaticalization. Second, extensively revised and updated edition. Cambridge University Press, 2019 (Co-edited by
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The Akie language of Tanzania: Texts and dictionary. Köppe, 2020 (Co-authored by Christa König, Karsten Legère, and Ingo Heine). •
Grammaticalization. Oxford University Press, 2021 (Co-authored by Heiko Narrog). •
The rise of discourse markers. Cambridge University Press, 2021 (Co-authored by Gunther Kaltenböck, Tania Kuteva, and Haiping Long). •
The Oxford handbook of grammaticalization. Oxford University Press, 2021 (Co-edited by Heiko Narrog). ==External links==