El Sayary, A. M. A. (2014). The Effectiveness of Problem-Based Learning Strategy in STEM Education for Enhancing Students’ 21st Century-Skills.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)El Sayary, Areej Mohamed Adel. The Effectiveness of Problem-Based Learning Strategy in STEM Education for Enhancing Students’ 21st Century-Skills. 2014.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)El Sayary, Areej Mohamed Adel. The Effectiveness of Problem-Based Learning Strategy in STEM Education for Enhancing Students’ 21st Century-Skills. 2014.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.