Pyles, T., & Algeo, J. (1993). The origins and development of the English language (4th ed.). Harcourt Brace Jovanovich College Publishers.
Lua i Stíl Chicago (17ú heag.)Pyles, Thomas, agus John Algeo. The Origins and Development of the English Language. 4th ed. Fort Worth: Harcourt Brace Jovanovich College Publishers, 1993.
Lua MLA (9ú heag.)Pyles, Thomas, agus John Algeo. The Origins and Development of the English Language. 4th ed. Harcourt Brace Jovanovich College Publishers, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.