Probability Theory

https://en.wikipedia.org/wiki/Probability_theory

Probability: Theory and Examples https://services.math.duke.edu/~rtd/PTE/PTE5_011119.pdf by Rick Durrett 

https://services.math.duke.edu/~rtd/PTE/pte.html

https://www.cambridge.org/ca/universitypress/subjects/statistics-probability/probability-theory-and-stochastic-processes/probability-theory-and-examples-5th-edition?format=HB&isbn=9781108473682

https://en.wikipedia.org/wiki/History_of_probability

https://en.wikipedia.org/wiki/Timeline_of_probability_and_statistics

https://thedigitallabyrinth.blogspot.com/search?q=Probability+Theory