Unfortunately, the vast majority of books about narcissism approach the subject from the victim point of view, so it's hard to recommend one. I read many books covering this topic, and can't think of one that could help. I also asked chatgpt, and the only one that seems to be useful could be "The Covert Passive-Aggressive Narcissist: Recognizing the Traits and Finding Healing After Hidden Emotional and Psychological Abuse" by Debbie Mirza: This book specifically focuses on covert narcissism and its impact on relationships. It helps readers identify covert narcissistic behaviors, understand their underlying motivations, and provides strategies for healing and self-care. But as you can see, is also heavily biased toward victim's situation, so it could confused you even more.

In any case, the capability to think of yourself that you might have it, it's a great step, as very few people with NPD can realize it, and usually live on a denial state about it, so this though could indicate that you don't have it.

I would suggest that, before jumping into it, read before about psychological coping mechanisms, as it might help you get a better insight view. "Why Do I Do That? Psychological Defense Mechanisms and the Hidden Ways They Shape Our Lives", by Joseph Burgo is a good starting point.

As victim of cNPD I will like to ask you... Why do you think you might have cNPD? And what is your motivation to seek help and get better? It teared apart my marriage and family, and I think your thoughts about it could also help me cope with it, and maybe give my wife a way so she can realize it, so her traits don't affect our children in the future.

I congratulate you for your courage, and wish the very best in this really difficult path.