APA Style

Blake, G., Bly, R, W. (1991). The Elements of Business Writing: A Guide to Writing Clear, Concise Letters, Memos, Reports, Proposals, and Other Business Documents . New York: Collier Books.

MLA Style

Blake, Gary., Bly, Robert, W.. "The Elements of Business Writing: A Guide to Writing Clear, Concise Letters, Memos, Reports, Proposals, and Other Business Documents". New York: Collier Books, 1991. Text.