APA
Williams E. E., Thomson J. R. & Napier H. A. (1999). Business planning : 25 keys to a sound business plan. New York, N.Y: Lebhar-Friedman.
Chicago
Williams Edward E, Thomson James R and Napier H Albert. 1999. Business planning : 25 keys to a sound business plan. New York, N.Y: Lebhar-Friedman.
Harvard
Williams E. E., Thomson J. R. and Napier H. A. (1999). Business planning : 25 keys to a sound business plan. New York, N.Y: Lebhar-Friedman.
MLA
Williams Edward E, Thomson James R and Napier H Albert. Business planning : 25 keys to a sound business plan. New York, N.Y: Lebhar-Friedman. 1999.