| 1 |
Intellectual disabilities across the lifespan / Clifford J. Drew, Michael L. Hardman
9th ed. - Upper Saddle River, N.J. : Pearson Merril Prentice Hall , c2007
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| 2 |
Human exceptionality : school, community, and family / Michael L. Hardman, Clifford J. Drew, W. Winston Egan
8th ed, IDEA 2004 update ed. - Boston : Pearson Allyn and Bacon , c2006
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| 3 |
Designing and conducting research : inquiry in education and social science / Clifford J. Drew, Michael L. Hardman, Ann Weaver Hart
paper. - 2nd ed. - Boston : Allyn and Bacon , c1996
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| 4 |
Designing and conducting behavioral research / Clifford J. Drew, Michael L. Hardman
: pbk.. - New York : Pergamon Press , c1985
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