Eng, G. G. (2002). The understanding of the nature of science and its relationships with cognitive level, science major and academic achivement of form six science students.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Eng, Guan Guch. The Understanding of the Nature of Science and Its Relationships with Cognitive Level, Science Major and Academic Achivement of Form Six Science Students. 2002.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Eng, Guan Guch. The Understanding of the Nature of Science and Its Relationships with Cognitive Level, Science Major and Academic Achivement of Form Six Science Students. 2002.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.