I am interested in philosophical or logic-based texts that discuss the nature of self-evident truths, which seem related to Alvin Plantinga's discussion of so-called properly basic beliefs. I am more specifically interested in the various epistemological views on self-evidence, as I think Locke and Hume both had ideas on this topic. I couldn't really find much substance on SEP or Wikipedia. Actually, SEP has a list of references at the bottom of the linked page on Evidence, but I don't know which references would discuss self-evident truths. I guess any book on basic epistemology or evidence listed would discuss it? I would appreciate specific recommendations. I also just found the self-evidence discussion under the Intuitionism in Ethics article in SEP.
For example, why would 2+2=4 be a self-evident truth? Some epistemologists reject the notion of self-evident truths. It seems some identified "self-evident truths" aren't really self-evidence since various people don't agree. If something were truly self-evident, then it would not depend on the perspective of the viewer since it only depends on the self (the object in question). I understand self-evidence to be a subset of a priori knowledge, and brute facts to be just a related topic.
When searching (such as on Google Scholar or JSTOR or PhilPapers), much of the discussion is with respect to the very important statement in the Declaration of Independence
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights...
I am not very interested in anything politically focused or too specific, but a generalized discussion of the nature self-evident truths (if, in fact, they exist). Wikipedia suggests that a self-evident truth is "one whose denial is self-contradictory" but no source mentioned.
What books or review papers cover the subject of self-evidence as a whole, present various epistemological views of self-evident truths, and discuss them extensively?