Investigación (3) Science (2) Cities and towns (2) Classification (2) Classification (2) Research (2) Comunicación (2) Recherche (2) Science (2) Recherche (2) recherche (2) sécurité (1) contrôle qualité (1) propriété (1) méthodologie (1) intérêts (1) firme (1) différenciation (1) classification (1) prescription (1) Bogotá (1) Education (1) Economic conditions (1) Discipline (1) Differentiation (1) Ownership (1) Children (1) Books and reading (1) Communication (1) Terms and phrases (1)