I do a lot of reading and they are all ebooks. I have quite a list of sources and books in that category. One of the best books around on righteousness by faith is Christ our Righteousness written by A. G. Daniels that is found in the APL. It was published in 1942, if my memory serves me right. and is almost entirely scripture and Ellen White quotes on the subject.

Another is History of the Reformation of the Sixteenth Century written by J. H. Merle D'Aubigne. He is quoted quite extensively by Ellen White in The Great Controversy in the chapter on the Reformation. It's really interesting to see how far modern Protestantism has moved away from the beliefs of the Reformers. It can be downloaded from Project Gutenberg.

I found a site that has the best collection of Martin Luther's and John Calvin's writings I have seen any where. I post this because I think when witnessing to Baptists or Lutherans the ability to point out how far their denominations have moved away from their founder's beliefs is a very good tool to have.

https://www.bookyards.com/en/author/page/3289/Luther-Martin

https://www.bookyards.com/en/author/page/2953/Calvin-John

I have a few more books that I'd like to mention. The author was F, C. Gilbert. He was born a jew in the later 18000s and converted to Christianity and SDAism after he moved to the US in mid life. He first got me interested in reading the Talmud as I hadn't heard of it before reading his book Practical Lessons from the Experience of Israel.

He authored several books and they can be downloaded from several sites on the internet. They are well worth reading. However you'll have to search for them yourselves as I'm too lazy to find all those sites again and create links here for you. Actually I'm not to lazy I had a stroke a year ago+ and it is a real pain for me to type now with only one hand that works very well.

Another one of F, C. Gilbert's books is his autobiography titled From Judaism to Christianity. It's a very good read and I've started posting it on Christian Forums in the Sabbath and Law forum.