Job satisfaction and job performance among the middle management personnel of the Sudanese public service 2026-02-15T20:45:35+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - El Safy, Hamid El Tag H. (University of Southern California,Faculty of the graduate School, 1985)