General reference encyclopedias (like Credo Reference and Gale Virtual Reference) are excellent places to get background information about your topic. Background information will help you start your research.
The establishment of public administration as a professional field is a twentieth-century development. Public administration today has its own knowledge base, schools of public administration and public policy to train practitioners, and professional associations - all hallmarks of professional status. Civil servants are trained in universities, and appropriate expert credentials are prerequisites for careers in public bureaucracies. Methods of program evaluation, cost-benefit analysis, and the integration of legal and economic analyses are now part of the core training of public administrators.
Public Adminastration - (2006). In Cambridge Dictionary of Sociology.