OECD (2014). Education at a Glance 2014: OECD Indicator. OECD Publishing
Education at a Glance 2014: OECD Indicators offers a rich, comparable and up-to-date array of indicators that reflects a consensus among professionals on how to measure the current state of education internationally. The indicators provide information on the human and financial resources invested in education, how education and learning systems operate and evolve, and the returns to investments in education. The indicators are organized thematically and each is accompanied by information on the policy context and an interpretation of the data.