You can find articles on political advertising in many publications. We do have a journal which specializes in political communication, Political Communication. We also have an article index which looks at all types of communication, CMMC. You can start your research there or use an index such as Web of Science. You can also use the search box at the top of the page.
Political communication
by
Taylor & Francis
Communication & mass media complete (CMMC)
by
Ebsco
The web of science citation databases
by
ISI (Institute for Scientific Information)