preparatory department . Haridussõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//har/preparatory%20department/1/eng (23.09.2026)
preparatory department . Haridussõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//har/preparatory%20department/1/eng (23.09.2026)