Northern, J. L., & Downs, M. (1974). Hearing in Children. Lippincott Williams & Wilkins.
Lua i Stíl Chicago (17ú heag.)Northern, Jerry L., agus Marion Downs. Hearing in Children. Lippincott Williams & Wilkins, 1974.
Lua MLA (9ú heag.)Northern, Jerry L., agus Marion Downs. Hearing in Children. Lippincott Williams & Wilkins, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.