Hardman, M. L., Drew, C. J., & Egan, M. W. (2008). Human exceptionality: School, community, and family (9th ed.). Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)Hardman, Michael L., Clifford J. Drew, agus M. Winston Egan. Human Exceptionality: School, Community, and Family. 9th ed. Boston: Houghton Mifflin, 2008.
Lua MLA (9ú heag.)Hardman, Michael L., et al. Human Exceptionality: School, Community, and Family. 9th ed. Houghton Mifflin, 2008.
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