Q. david and goliath
Try using this handy Research Guide that specializes in Library Research: http://libguides.mccd.edu/LibraryResearch
I recommend the Gale Virtual Reference Library, Salem Press and Encyclopedia Britannica or get the background information, then head into Literature Resource Center and EBSCO.
We have many books that provide historical analysis depending on the era: is this in reference to the archetype? Is this about David and Goliath antiquities? Using different keywords like "here" or "underdog' in combination with "david and goliath" in the your search string will be helpful.
Contact a librarian and we can help clarify :)