H George Frederickson & John A. Rohr 
Ethics and Public Administration [PDF ebook] 

"Ethics and Public Administration" refutes the arguments that administrative ethics cannot be studied in an empirical manner and that empirical analysis can deal only with the trivial issues in administrative ethics. Within a theoretical perspective, the authors qualify their findings and take care not to over-generalise results. The findings are relevant to the practice of public administration. Specific areas addressed include understanding public corruption, ethics as control, and ethics as administration and policy