Chang, S. (1974). The effects of encrichment activities on the development of scientific interest and the attainment of scientific concepts.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Chang, Shook-cheong. The Effects of Encrichment Activities on the Development of Scientific Interest and the Attainment of Scientific Concepts. 1974.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Chang, Shook-cheong. The Effects of Encrichment Activities on the Development of Scientific Interest and the Attainment of Scientific Concepts. 1974.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.