APA-ийн эшлэл(7 дахь хэвлэлт)

Monippally, M. (1997). The craft of business letter writing. TMH.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Monippally, Mathew. The Craft of Business Letter Writing. New delhi: TMH, 1997.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Monippally, Mathew. The Craft of Business Letter Writing. TMH, 1997.