These resources are based on the 16th edition (2010) of the Chicago Manual of Style.
These links will give you information on citing sources according to the 7th edition of A Manual for Writers of Research Papers, Theses, and Dissertations by Kate Turabian.
There are many online resources relating to the study of media from a historical perspective. This list of resources, while by no means exhaustive, provides a basic starting point for research on the the impact of the media in relation to events in American History.
Covers the history of the world (excluding the United States and Canada) from 1450 to the present