If there is are endnotes used in a paper, do you still need a workcited page or a bibliography?

In general, it's preferable to have both the end notes and the bibliography. Then if the bibliography includes all references in the notes, you can keep the information in your notes pretty concise, since readers can find the source information in the bibliography. However, if you decide to just do end notes, or if your bibliography does not have all the references you cited, you must give full and complete source information in the notes the first time you cite that source.