Q. I am writing my research paper for EN102. One of my references quotes other authors and cites their work. When I use this material do I cite

You will need to cite the author of the work and resources you are using.

The library has an excellent guide to assist you at http://libguides.limestone.edu/citation.  You can also find assistance at the Limesone College's Online Writing Lab at  http://my.limestone.edu/academic-resources/online-writing-lab.