Reference materials can be good resources for subject overviews and a means to collect useful keywords. The bibliographies frequently include key texts and thinkers that are associated with a specific subject. Tips for using reference sources: 1. Look at the cross-references that many entries provide. These can be helpful in pointing you toward a related or more accurate idea/term. 2. One of the most important elements of any good reference source entry is its bibliography. Take note of the books or articles that the entry's author deems elementary to understanding the individual or idea.