APA (7th ed.) Zitazioa
(2004). Reviews of national policies for education: Bulgaria. OECD.
Chicago Style (17th ed.) Zitazioa
Reviews of National Policies for Education: Bulgaria. Paris, France: OECD, 2004.
MLA (9th ed.) Zitazioa
Reviews of National Policies for Education: Bulgaria. OECD, 2004.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.