00817nam0-22003011i-450-9900031881104033210-8039-3775-X000318811FED01000318811(Aleph)000318811FED0100031881120000920d1991----km-y0itay50------baitaITScale DevelopmentTheory and ApplicationsRobert F. DeVellis.Newbury ParkLondonSage1991.120 p.19 cmApplied Social Research Methods Series2611360Devellis,Robert F.ITUNINARICAUNIMARCBK99000318811040332111360 DEV11372SESSESScale Development452104UNINAING01