توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Irfan Naufal Umar. (1999). A study of the effects of cognitive styles and learning strategies among Malaysian pre-college students in a hypermedia environment. University of Pittsburgh.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Irfan Naufal Umar. A Study of the Effects of Cognitive Styles and Learning Strategies Among Malaysian Pre-college Students in a Hypermedia Environment. Pittsburgh, PA: University of Pittsburgh, 1999.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Irfan Naufal Umar. A Study of the Effects of Cognitive Styles and Learning Strategies Among Malaysian Pre-college Students in a Hypermedia Environment. University of Pittsburgh, 1999.