BibTeX-Format:
@incollection{Klein 2009, author = {Klein, Katarina}, booktitle = {{D}escribing and {M}odeling {V}ariation in {G}rammar}, publisher = {Mouton de Gruyter}, title = {{S}emi-modal variation}, typ = {incollection}, sortname = {Klein}, series = {Trends in Linguistics. Studies and Monographs