Ringe, Don. 2006. A Linguistic History of English, From Proto-Indo-European to Proto-Germanic. Oxford: Oxford University Press.
@book{jacquesestimative-ringe06PIE,
author = {Ringe, Don},
publisher = {Oxford: Oxford University Press},
title = {A Linguistic History of English, From Proto-Indo-European to Proto-Germanic},
year = {2006}
}