00377nam a2200133 a 450000500170000002000150001708200160003210000240004824500470007226000290011930000190014849000470016763000290021420251203092044.0  a0803937768  a300.72bDEV  aDeVellis, Robert F.  aScale developmentbtheory and applications  aNewbury ParkbSagec1991  a121 p.c23 cm.  aApplied social Research methods seriesd26  aScaling(Social Sciences)