توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Singh, A. (2000). Principles of the Law of Sale of Goods and Hire Purchase: (Sale of Goods Act, 1930; Hire-Purchase Act, 1972) (5th ed.). Eastern Book Co..

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Singh, Avtar. Principles of the Law of Sale of Goods and Hire Purchase: (Sale of Goods Act, 1930; Hire-Purchase Act, 1972). 5th ed. Lucknow: Eastern Book Co., 2000.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Singh, Avtar. Principles of the Law of Sale of Goods and Hire Purchase: (Sale of Goods Act, 1930; Hire-Purchase Act, 1972). 5th ed. Eastern Book Co., 2000.