There are several other databases that you might search. I strongly recommend you search first in Worldwide Political Science Abstracts and PAIS, but the following are other choices for you to find scholarly articles.
Here are the databases I would recommend in political science:
There is a print reference set that indexes scholarly articles in the field of political science. Depending on your topic, you may want to take a look here.
Combined Retrospective Index to Journals in Political Science, 1886-1974.
Z 7162 .C75x (Reference)
This 8-volume set allows the user to search by broad keywords and topic areas to find articles about political science and its related fields in scholarly journals dating as far back as 1886, through 1974. One can also search by author names to get journal citations.