Tyson, K. W. (1997). Competition in the 21st century. St. Lucie Press.
Cita Chicago (17th ed.)Tyson, Kirk W.M. Competition in the 21st Century. Delray Beach, FL: St. Lucie Press, 1997.
Cita MLA (9th ed.)Tyson, Kirk W.M. Competition in the 21st Century. St. Lucie Press, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.