00275nam a22001217a 4500020001500000082001200015100002400027245002100051250000800072260005100080300000900131650001300140  a8177223720  a001.42   aTrochim,William M.K  aResearch methods  a2nd  aNew DelhibAn Imprint of Dreamtech Pressc2006  a363p  aresearch