Schiefelbusch, R. L. (1974). Language perspectives-acquisition, retardation, and intervention: Robert K. Hoyt. University Park Press.
Lua i Stíl Chicago (17ú heag.)Schiefelbusch, Richard L. Language Perspectives-acquisition, Retardation, and Intervention: Robert K. Hoyt. Baltimore: University Park Press, 1974.
Lua MLA (9ú heag.)Schiefelbusch, Richard L. Language Perspectives-acquisition, Retardation, and Intervention: Robert K. Hoyt. University Park Press, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.