APA-ийн эшлэл(7 дахь хэвлэлт)

Kothari, C. R. (2004). Research methodology: Methods & techniques (2nd rev. ed.). New Age International (P) Ltd., Publishers.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Kothari, C. R. Research Methodology: Methods & Techniques. 2nd rev. ed. New Delhi: New Age International (P) Ltd., Publishers, 2004.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Kothari, C. R. Research Methodology: Methods & Techniques. 2nd rev. ed. New Age International (P) Ltd., Publishers, 2004.