OECD (2008), "Table D5.2 - National periodical assessments in general education programmes (lower secondary education, 2006): Do you have national periodical assessments in your country?",
in
Education at a Glance 2008: OECD Indicators,
OECD Publishing, Paris,
https://doi.org/10.1787/eag-2008-tabled5_2-en.