R25 I53 Industry norms and key business ratios. The Service, 1988. HD 30.335 C76 Doing business on the Internet. By Mary J. Cronin. Van Nostrand Reinhold, 1994.
Business plans handbook.
Edited by Kristin Kahrs. Gale Research Inc., 1995. Enterprise Dearborn, 1993. By Joseph Mancuso. Prentice Hall, 1988.