Here, in no particular order, are some books we’ve found useful:
Ethics for Adversaries, by Arthur Isak Applbaum (Princeton University Press, 2000)
The Ethic of Competition, by Frank Knight (Transaction Publishers, 1997)
On the Side of the Angels: An Appreciation of Parties and Partisanship, by Nancy L. Rosenblum (Princeton University Press, 2008)
Lawyers and Justice: an Ethical Study, by David Luban (Princeton University Press, 1988)
A Modern Legal Ethics: Adversary Advocacy in a Democratic Age, by Daniel Markovits (Princeton University Press, 2011)
The philosophy of sport: a collection of original essays, by Osterhoudt, Robert, ed. (Charles Thomas Publisher, 1973)
Philosophic Inquiry in Sport, by William J Morgan and Klaus V. Meier, eds. (Human Kinetics Publishers; 2nd edition, 1995)
Ethics in Sport, by William J Morgan (Human Kinetics, 2 edition 2007)
Ethics for Adversaries 
Pingback: Is bluffing just business, or is it bad business? | Ethics for Adversaries