APA-ийн эшлэл(7 дахь хэвлэлт)

Singh Avtar. (1999). Introduction to law of Contract (3.). Eastern Book company.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Singh Avtar. Introduction to Law of Contract. 3. Lucknow: Eastern Book company, 1999.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Singh Avtar. Introduction to Law of Contract. 3. Eastern Book company, 1999.