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Hello and thank you for using JustAnswer. Well Egocentrism has not been a popular topic of research for the last 20-30 years, so most of the relevant research was really done in the 60's, 70's, and 80's. With that being said some lead researchers in this would be James Peters Phd, Edward Royzman PhD, David Elkind PhD, ***** *****dler PhD, William Looft, PhD, Sidney Blatt PhD, Frances Aboud PhD, and Kenneth Rubin PhD. I am not aware of any books on this subject, but if you search for these authors I am sure you will be able to find a number of journal articles on the subject.
Mostly it has fallen out of favor as a theoretical topic that has relatively no relevance in developmental psychology.
It could be traits of a personality disorder that would cover that, but without a face to face evaluation it not be possible for me to make any determinations
If you have any more questions you are more than welcome to ask them as I am happy to continue assisting you on this topic.
I am sorry you feel that way. You are more than welcome to keep discussing this question with me if you like when you are ready, but truthfully you are asking about a concept that has fallen out of favor in the last 20-30 years. Good luck to you and I wish you all the best with your research.
You can contact customer service regarding that. Experts have no access to the financial dealings on this website. As a professional, I would suggest that you start to look at traits of personality disorders like Narcissistic Personality Disorder and Antisocial Personality Disorder to find what you are looking for as there is much more empirical backing for your research. Good luck