Não informado. (1972). School psychology digest. National Association of School Psychologists.
Lua i Stíl Chicago (17ú heag.)Não informado. School Psychology Digest. Cuyahoga Falls, Ohio: National Association of School Psychologists, 1972.
Lua MLA (8ú heag.)Não informado. School Psychology Digest. National Association of School Psychologists, 1972.
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