Matthews, Peter H. (2014). The concise Oxford dictionary of linguistics. Oxford University Press (Third ed.). Oxford. ISBN9780191753060. OCLC881847972.{{cite book}}: CS1 maint: location missing publisher (link)
Lyle., Campbell (2004). Historical linguistics : an introduction (2nd ed.). Cambridge, Mass.: MIT Press. ISBN0262532670. OCLC54692867.
