Heath, E. J. (1970). The mentally retarded student and guidance. Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Heath, Earl J. The Mentally Retarded Student and Guidance. Boston: Houghton Mifflin, 1970.
Lua MLA (9ú heag.)Heath, Earl J. The Mentally Retarded Student and Guidance. Houghton Mifflin, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.