HARTLEY, X. (1987). A SUMMARY OF RECENT RESEARCH INTO THE DEVELOPMENT OF CHILDREN WITH DOWN'S SYNDROME.
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Tohutoru Kātū Chicago (17th ed.)
HARTLEY, X.Y. A SUMMARY OF RECENT RESEARCH INTO THE DEVELOPMENT OF CHILDREN WITH DOWN'S SYNDROME. 1987.
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Tohutoro MLA (9th ed.)
HARTLEY, X.Y. A SUMMARY OF RECENT RESEARCH INTO THE DEVELOPMENT OF CHILDREN WITH DOWN'S SYNDROME. 1987.
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