TY JOUR TI Bilingual economics education as a factor of human capital development: pedagogical approaches KW bilingual education KW human capital KW economic education KW CLIL KW return on language skills KW investment in education JO Journal of Applied Research AU Astarkhanova, N.R. AU Gadzhieva, S.A. AU Daudov, S.A. PY 2026 IS 0 PB ITBO University