Ethical Guidelines, Standards and Practices, Ethics Policies, and other policies tend to share some similar principles: minimize harm, accountability, transparency, fairness, accuracy, and fairness. You can find most news agency or company policies by searching [news source]AND"ethics;" what do these policies tell you about the values of where you get your news? What does it tell you if you can't find such a statement?
For more on media ethics generally, check out the University of Wisconsin-Madison's Center for Journalism Ethics Resources Page.
This page includes a few example policies and some reference sources for analysing media ethics policies and standards.
Media Ethics, Free Speech, and the Requirements of Democracy by 
