Psacharopoulos, G. (1980). Information, an essential factor in educational planning and policy. Unesco.
Citazione stile Chigago Style (17a edizione)Psacharopoulos, George. Information, an Essential Factor in Educational Planning and Policy. Paris: Unesco, 1980.
Citatione MLA (9a ed.)Psacharopoulos, George. Information, an Essential Factor in Educational Planning and Policy. Unesco, 1980.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.