References
Emmerson, Paul (2013). Email English 2nd edition. London: Macmillan
Seglin, Jeffry L & Coleman, Edward (2012). The AMA Handbook of Business
Letters 4th ed. New York: AMACOM
E N G L I S H F O R E C O N O M I C D E V E L O P M E N T P A G E 1 1