Librarians are really helpful at this point of the project development.
Don't avoid the actual library and ask the librarian to provide you with some interesting publications.
Now, you're left with the most important stage of the dissertation writing process: composing the actual project, which will be the final product of all your efforts.
It's surprising to see that many students have some level of confidence during the previous two stages of the process, but they crack when they realize they don't really know how to write a dissertation.
A thesis, on the other hand, is crafted for the completion of a Master's degree.
However, the term dissertation is also used for the final project that Ph D candidates present before gaining their doctoral degree.
However, you have to realize that not everything you read on the Internet is absolutely true.
Double-check the information you find and make sure it comes from a trustworthy resource.
Remember: you already did a great job up to this point, so you have to proceed. You already have the dissertation proposal, which is a preliminary outline for the actual dissertation.
However, you still need a more detailed outline for the large project.