According to APA style guide, the "Works Cited" would appear A. on a separate page at the end of the document. As with most citation styles, they always appear at the end of the document for easy reference once the reader has finished and wants to refer to your sources. There are no styles that call for it at the beginning of the paper. Sources that are on the bottom of each page are called footnotes or endnotes and are only brief and there for numbered reference.