Dyfyniad APA

American Association on Mental Deficiency. (1940). American journal of mental deficiency. American Association on Mental Deficiency.

Dyfyniad Arddull Chicago

American Association on Mental Deficiency. American Journal of Mental Deficiency. Washington, D.C: American Association on Mental Deficiency, 1940.

Dyfyniad MLA

American Association on Mental Deficiency. American Journal of Mental Deficiency. American Association on Mental Deficiency, 1940.

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