Now that you have the basis for a bibliography, you have to run both latex and bibtex on the document. First, you should run latex (to create a file, which bibtex reads). Then run bibtex once to get some of the citations and create a .bbl file. Then run latex again so that the cross references between the text file and the bibliography are correct. You may want to repeat running bibtex and latex on the file to make sure that all cross references are correct. Be warned that adding/deleting citations and sources will require running bibtex again.