I'm currently about to finish my BA thesis, and my topic is bullying. I have read several books, studies, and such that can be connected to my topic. I finished the literature review, but haven't touched it since. However, when I recently re-read it and looked at the sources, I have found that a lot of my sub-chapters in my lit. review are really similar to those in the literature. For instance, in the work I read, the author mentions the consequences of bullying and I also have a sub-chapter dedicated to this. Or for example, I have read about strain theory in another one of the studies that I have also included and wrote about in one of my sub-chapters. I did not include every single aspect of these particular studies, just specific parts that I found relevant in my study.
My question is the following: Is this considered plagiarism?