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