A study compared the effectiveness of the FirstSearch WorldCat database and Dissertation Abstracts on CitaDel in providing access to dissertations. Results indicate that both systems are useful and that search results were unique to each system.
Salisbury, L., & Perry, S. (1995). Access to Information in both CitaDel and FirstSearch: a Comperative Study of Dissertation Coverage. University Libraries Faculty Publications and Presentations. Retrieved from https://scholarworks.uark.edu/libpub/7