Answer:
She should include all sources in her bibliography and use in-text citations to reference them in her paper.
Step-by-step explanation:
Whenever information from another source is used, regardless of whether it's a primary or secondary source or if the information is paraphrased or directly quoted, it's always important to include the citations of where the information was found to give credit to those authors.
Here, Debbie needs to provide a bibliography, which is essentially a list of books that the author referenced in his/her paper, as well as in-text citations; for example (Smith 90) if the author cited had a last name of Smith and the information was found on page 90.
Thus the answer is C.