Implicit in this discussion of documentation is the principle that you should always state the source of any prior writing you are using for your research paper. This applies even to your own work. For example, if your thesis expands on research done for a term paper, you should reference your earlier work appropriately so that the specific contribution of the thesis is clear. Occasionally students will want to prepare a single paper for two purposes, . a joint term paper for two courses, or a joint thesis for a double major. Before beginning, you must consult with both instructors, so that the concept of the paper is clear to all, and the separate contribution for each instructor is clearly defined.