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沢田 慶輔, 氷室 英夫, 石塚 喜三郎, 上野 武雄, 齋藤 昭次. "232 人間愛の発達についての研究(I) : 4.友人愛の発達(d.幼児III,2.発達心理)." Annual Convention of the Japanese Association of Educational Psychology 8.0 (1966) 73-74