Karen Kidd has a few books on the topic.....
Years ago I was on another boards with Bro Karen. She gave me a much better understanding of regularity. It's wonderfully short, and if you have not read it before (and I am sure many of you would have) read her "I am Regular" essay
http://beacon190.ca/2017/02/11/i-am-regular/
Back to the topic. Firstly, to the casual reader, I will say Freemasonry is not a Religion, its a Fraternity, but I will use a Religious analogy to explain my view on "Freemasonry" which I see as a broad term like "Christianity". Within Christianity you have Catholic and Protestants, and within Protestantism all sorts of groups like Anglicans, Baptists, Lutherans, Methodists, Pentecostals etc etc. All have some shared beliefs and are Christians but also have their own beliefs, traditions and history. So it is with "Freemasonry". As a respectful and open minded man, I would not say one Christian Church is more valid in society simply because I subscribe to it and not others. Just as I believe in Freedom of Religion, I also, for want of other phrase, believe in Freedom of Freemasonry. To show a lack of respect for others masonic traditions is bad manners and in much the same way I am cautious in showing a lack of respect for any Religion which is not a scam designed to fleece people.
Indeed, just as traditions like Buddhism and Hinduism have informed by Christian journey and understanding, so is it with other masonic traditions which have informed and supported my masonic journey in what is broadly regarded as "regular Freemasonry". I am confident enough in the Traditions and merit of my Grand Lodge so as not to be threatened by any other - even if it happened to be larger or more popular, which to date, is not the case...
Just as I respect those who walk another Religious Path, I afford a similar respect those who walk another Masonic Path.