EndNote - is a program that can help you manage citations for your research projects. It can automate much of the work of organizing and formatting citations and bibliographies in your writing. EndNote can connect to online sources such as GIL and article databases, output results in over 1,000 different bibliographic styles.
Zotero -is an application that collects, manages, and cites research sources. It's easy to use, connects with your web browser to download sources, and best of all it's free.