"Leermiddelen." . . "Educational technology." . . "Technologie éducative Coût." . . "Planning." . . "Cost factors in planning educational technology systems" . . . "Cost Facts in Planning Educational Technology Systems"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . "Cost factors in planning educational technology system" . . . . . . . . . . "Cost factors in planning educational technology systems"@en . "Audio-visual education." . . "Radio en éducation Coût." . . "Unterrichtstechnologie" . . "Innovaciones educativas." . . "Education Costs." . . "Radio." . . "TECNOLOGIA EDUCATIVA COSTOS." . . "Kostenplanung" . . "EDUCACION PLANIFICACION." . . "Televisie." . . "Educación Costos." . . "Kosten." . . "Načrtovanje izobraževanja Financiranje Izobraževalna tehnologija." . . . . "Télévision en éducation Coût." . .