SuperSearch is a great place to start for journal articles, books and almost everything else the library has, in one easy to use interface.
For searching with more focus and precision, try one of the databases recommended on this guide.
Online Sources:
Encyclopedia of Contemporary Spanish Culture
Historical Dictionary of Spain
Historical Dictionary of the Catalans by 
Historical Dictionary of the Spanish Civil War by 
Historical Dictionary of Spanish Cinema by Print Sources:
If you need help on how to write in Spanish using your computer, please check out the guide, Writing in a Foreign Language.