I don't have time to give you a more authoritative source but here is a Wikipedia article on how the Pharisees that escaped Jerusalem after its destruction in 70 AD created Rabbinical Judaism:
Look at the footnotes for more authoritative sources.
Heck, do a Google search and you will find several Jewish websites that talk about the history of Judaism and they openly admit that Rabbinical Judaism was created by Pharisees....
This is not even a controversial point to make. It's just hard, easily provable fact.
It's not a theory... I am speaking fact.
I don't have time to give you a more authoritative source but here is a Wikipedia article on how the Pharisees that escaped Jerusalem after its destruction in 70 AD created Rabbinical Judaism:
https://en.wikipedia.org/wiki/Rabbinic_Judaism#:~:text=Rabbinic%20Judaism%20has%20its%20roots,orally%2C%20explains%20the%20Written%20Torah.
Look at the footnotes for more authoritative sources.
Heck, do a Google search and you will find several Jewish websites that talk about the history of Judaism and they openly admit that Rabbinical Judaism was created by Pharisees....
This is not even a controversial point to make. It's just hard, easily provable fact.