APA استشهاد

Avtar Singh. (1999). Law of contract (7th ed.). Eastern book company.

استشهاد بنمط شيكاغو

Avtar Singh. Law of Contract. 7th ed. Lucknow: Eastern book company, 1999.

MLA استشهاد

Avtar Singh. Law of Contract. 7th ed. Eastern book company, 1999.