The Evolution of Pragmatic Markers in English: Pathways of ...
Laurel J. Brinton
Brinton, Laurel J. 2006. Pathways in the development of pragmatic markers in English. In Ans van Kemenade and Bettelou Los (eds.), The handbook of the history of English, 307–334. Oxford: Blackwell. DOI: 10.1002/9780470757048. ch13.