APA
Organisation for Economic Co-Operation and Development (OECD), . (2004). Bulgaria: Reviews of National Policies for Education. Paris: OECD.
Chicago
Organisation for Economic Co-Operation and Development (OECD), . 2004. Bulgaria: Reviews of National Policies for Education. Paris: OECD.
Harvard
Organisation for Economic Co-Operation and Development (OECD), . (2004). Bulgaria: Reviews of National Policies for Education. Paris: OECD.
MLA
Organisation for Economic Co-Operation and Development (OECD), . Bulgaria: Reviews of National Policies for Education. Paris: OECD. 2004.