Playground and Recreation Association of America. The year book of the Playground and Recreation Association of America. Playground and Recreation Association of America.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Playground and Recreation Association of America. The Year Book of the Playground and Recreation Association of America. New York City: Playground and Recreation Association of America.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Playground and Recreation Association of America. The Year Book of the Playground and Recreation Association of America. Playground and Recreation Association of America.
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