توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Atikullah Abdullah. (1998). A critical study of the concept of gharar and its elements in islamic law of business contract. University of Birmingham.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Atikullah Abdullah. A Critical Study of the Concept of Gharar and Its Elements in Islamic Law of Business Contract. Birmingham: University of Birmingham, 1998.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Atikullah Abdullah. A Critical Study of the Concept of Gharar and Its Elements in Islamic Law of Business Contract. University of Birmingham, 1998.