Hartzog, H. S., & Ernst, D. (1936). Webster language: A combined workbook & textbook. Webster Publishing Company.
Lua i Stíl Chicago (17ú heag.)Hartzog, Henry S., agus Dora Ernst. Webster Language: A Combined Workbook & Textbook. Saint Louis: Webster Publishing Company, 1936.
Lua MLA (8ú heag.)Hartzog, Henry S., agus Dora Ernst. Webster Language: A Combined Workbook & Textbook. Webster Publishing Company, 1936.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.