(Scroll down to Citation Management Software)
These systems are designed to help you collect and organize your list of sources and citations. There are descriptions of Zotero and Mendeley (both free) and to EndNote (free 30-day trial but then have to buy software from bookstore). RefWorks is going away in Dec. 2015 as a free service but can be purchased by individuals.
If you need to create an annotated bibliography (formal list of citations, each with a brief description), this tutorial will help.
Zotero and other management tools will help you create a bibliography with your collected citations.