Lenkeit, J. (2013). How effective are educational systems? A value-added approach to study trends in PIRLS. Waxmann.
Chicago-referens (17:e uppl.)Lenkeit, J. How Effective Are Educational Systems? A Value-added Approach to Study Trends in PIRLS. Waxmann, 2013.
MLA-referens (9:e uppl.)Lenkeit, J. How Effective Are Educational Systems? A Value-added Approach to Study Trends in PIRLS. Waxmann, 2013.
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