Unfortunately, there is no simple way to determine if you have completely exhausted the literature on your topic. Below is a checklist of common resources and techniques to make sure that you have explored all available resources.
In this webinar designed for Ph.D. students, we will discuss a five-step strategy for using exploratory library research to find a gap in the literature followed by a practical demonstration in the Walden Library databases.
Video: How to Find a Gap in the Literature (YouTube)
Recorded May 2018 (50 min 22 sec)