Introduction to factor analysis : what it is and how to do it 2026-02-16T07:31:55+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Kim, Jae-on; Mueller, Charles W. (A Sage university paper, 1978)