Bovee, C.L., & Thill, J.V. (1989). Business communication today. 2nd ed. New York: Random House.
2.
Cross, G.A. (1990). A Bakhtinian exploration of factors affecting the collaborative writing of an executive letter of an annual report. Research in the teaching of English, 24(2), 173-203.
3.
Hirsch, E.D., Jr. (1977). The philosophy of composition. Chicago: University of Chicago Press.
4.
Lesikar, R.V. (1991). Basic business communication. 5th ed. Homewood, IL: Richard D. Irwin.
5.
Ober, S., & Wunsch, A.P. (1991). The status of postsecondary business communication instruction: A longitudinal study. The Delta Pi Epsilon journal , 33(3),146-57.
6.
Redish, J.C., & Selzer, J. (1985). The place of readability formulas in technical communication. Technical communication, 32(4), 46-52.
7.
Struck, H.R. (1965). Better prose: A method. Boston : Houghton Mifflin.