Lawrence Erlbaum Associates, Publishers, 2004
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Apps, Jerold W., author
Jossey-Bass Publishers, 1985
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Hirsch, Eric Donald, Jr., author
Houghton Miffiln, 2007
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Grasso, John T.
Carnegie Foundation, 1979
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Severinghaus, Aura E., author
McGraw-Hill , 1953
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