Gattegno, C. (1969). Reading with words in colour: A scientific study of the problems of reading. Educational Explorers.
Chicago-viite (17. p.)Gattegno, Caleb. Reading with Words in Colour: A Scientific Study of the Problems of Reading. Berkshire, Eng: Educational Explorers, 1969.
MLA-viite (9. p.)Gattegno, Caleb. Reading with Words in Colour: A Scientific Study of the Problems of Reading. Educational Explorers, 1969.
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