Pidgeon, D. A. (1967). Achievement in mathematics: A national study of secondary schools. Bucks : National Foundation for Educational Research in England and Wales.
Citace podle Chicago (17th ed.)Pidgeon, Douglas A. Achievement in Mathematics: A National Study of Secondary Schools. Bucks : National Foundation for Educational Research in England and Wales, 1967.
Citace podle MLA (9th ed.)Pidgeon, Douglas A. Achievement in Mathematics: A National Study of Secondary Schools. Bucks : National Foundation for Educational Research in England and Wales, 1967.
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