The following Reference books appear in various Duke Libraries.
Dictionary of Ethics, Thelogy and Society
Ref BJ63 .D45 1996 at Divinity, Lilly, and Perkins
ABA Compendium of Professional Responsiblity Rules and Standards
Law Reserve KF305 .A2 A23
Includes the ABA Model Rules of Professional Conduct (also online) which serves as model for each state bar's rules for professional responsibility.
Blackwell Encyclopedia of Management: Volume II Business ethics