1. Research methods in education;COHEN L.,1994
2. Educational research: Competencies for analysis and application;GAY L. R.,1976
3. A teachers guide to classroom research;HOPKINS D.,1993
4. Méthologie du recueil d'informations: fondements de méthodes d'observation de questionaires, d'interviews et d'étude de documents;KETELE J.,1993
5. Forschungs-Wörterbuch. Grundbefriffe: Lektüre wissenschaftlicher texte;KRAPP A.,1982