Monippally, M. (1997). The craft of business letter writing. TMH.
Citazione stile Chigago Style (17a edizione)Monippally, Mathew. The Craft of Business Letter Writing. New delhi: TMH, 1997.
Citatione MLA (9a ed.)Monippally, Mathew. The Craft of Business Letter Writing. TMH, 1997.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.