references & bibliography

a friend of mine - an academic historian - once mentioned that there is software specifically for tracking sources, quotes, and footnotes while you're composing a paper, and printing out a properly linked and formatted bibliography. (this is probably hidden somewhere in one of msword's sub-sub-submenus)
For years I've been occasionally daydreaming about displaying a universal bibliography in the form of a network graph (I've never gotten very far because I can't decide whether to have the links show explicit references, quotations/stealing of text or phrases, stylistic influences, shared subject matter...) that connects all the books in the western cannon. But it would be far simpler to perform this operation for a relatively finite set of books like the bibliography for a single paper.
The program could draw from a database that already lists all the references in the bibliography of published books, or rely on the user to scan in and OCR a few pages from each of the books. The resulting web would give a quick visual sense of how broadly the writer has researched or what state the field is in - if all the references are highly interconnected, it's a well-defined field and/or the writer hasn't performed any great synthesis, while an unconnected graph would indicate original research and new insights (assuming the database the links are drawn from is complete and accurate).