Aškerc, K., & Gasparič, R. P. (2012). Bray, M. (2009). Confronting the Shadow Education System: What Government Policies for What Private Tutoring? Paris: International Institute for Educational Planning. 134 p., ISBN 978-92-803-1333-8. University of Ljubljana.
Cita Chicago Style (17a ed.)Aškerc, Katarina, y Romina Plešec Gasparič. Bray, M. (2009). Confronting the Shadow Education System: What Government Policies for What Private Tutoring? Paris: International Institute for Educational Planning. 134 P., ISBN 978-92-803-1333-8. University of Ljubljana, 2012.
Cita MLA (8a ed.)Aškerc, Katarina, y Romina Plešec Gasparič. Bray, M. (2009). Confronting the Shadow Education System: What Government Policies for What Private Tutoring? Paris: International Institute for Educational Planning. 134 P., ISBN 978-92-803-1333-8. University of Ljubljana, 2012.