Linguistic universals and language change. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Linguistic Universals and Language Change. Oxford University Press.
Lua MLA (8ú heag.)Linguistic Universals and Language Change. Oxford University Press.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.