By Archer, Thomas P.. New York : McGraw-Hill, 1999 . ix, 373p. ill. 0070066922
]]>By HEFFNER E. JOHN. Philadelphia:b 2001 . 245p.:ill 1560534044
]]>By Gandhi, Monica.. Massachusetts : Blackwell publishing co. , 2002 . xii, 143p. : , Includes index. 0632046031
]]>By Collins, R. Douglas.. Philadelphia : Lippincott, 1974 0397503326
]]>By HEFFNER E. JOHN. Philadelphia:b 2001 . 245p.:ill 1560534044
]]>By Archer, Thomas P.. New York : McGraw-Hill, 1999 . ix, 373p. ill. 0070066922
]]>By Gandhi, Monica.. Massachusetts : Blackwell publishing co. , 2002 . xii, 143p. : , Includes index. 0632046031
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