Não informado. (1964). Educational and Psychological Interactions. University of Lund, Malmo School of Education.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Educational and Psychological Interactions. Malmo, Suecia: University of Lund, Malmo School of Education, 1964.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Educational and Psychological Interactions. University of Lund, Malmo School of Education, 1964.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.