Additional bibliography for study
Brook, G. L. 1978. A History of the English Language. Andre Deutsch.
Graddol, D., Leith, D. & Swann, J. 2002. English: History, Diversity and Change. London: Routledge.
Hogg, R. M., Blake, N. F. & Burchfield, R. W. 1992. The Cambridge History of the English Language. Cambridge University Press.
Longobardi, G., Guardiano, C., Silvestri, G., Boattini, A. & Ceolin, A. 2013. Toward a syntactic phylogeny of modern Indo-European languages. Journal of Historical Linguistics 3 (1), 122-152.