I see that gjm has replied with beautifully typeset text.
What is a reference image?
I have a confession to make, I can make no sense of probability as degree of belief. The measure-theoretic definition (due to Kolmogoroff?) suits me and I have never progressed beyond it. I can do naught but beg your forgiveness.
Since different people have different tastes and different needs, I doubt that there is a best textbook on any subject. As for 'every subject', what can that possibly means?
Do you play go?