Bray, M. (1999). The shadow education system: Private tutoring and its implications for planners. Unesco, International Institute for Educational Planning.
Dyfyniad Arddull ChicagoBray, Mark. The Shadow Education System: Private Tutoring and Its Implications for Planners. Paris: Unesco, International Institute for Educational Planning, 1999.
Dyfyniad MLABray, Mark. The Shadow Education System: Private Tutoring and Its Implications for Planners. Unesco, International Institute for Educational Planning, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.