Dixson, R. J., & Boggs, R. S. Sound teaching a laboratory manual of American english.
Lua i Stíl Chicago (17ú heag.)Dixson, Robert J., agus Ralph S. Boggs. Sound Teaching a Laboratory Manual of American English.
Lua MLA (8ú heag.)Dixson, Robert J., agus Ralph S. Boggs. Sound Teaching a Laboratory Manual of American English.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.