APA

Blake G., Bly R. W., . (1991). The elements of business writing. New York: Macmillan Pub. Co.

Chicago

Blake Gary, Bly Robert W, . 1991. The elements of business writing. New York: Macmillan Pub. Co.

Harvard

Blake G., Bly R. W., . (1991). The elements of business writing. New York: Macmillan Pub. Co.

MLA

Blake Gary, Bly Robert W, . The elements of business writing. New York: Macmillan Pub. Co. 1991.