Now now. They were Republican. They are now Libertarian.
They are just political hacks who don't understand or even subscribe to much libertarian philosophy regardless of which political parties were willing to nominate or get them elected governors.
Has anyone written a definitive bible on libertarian philosophy?
libertarian philosophy has many subgroupings and nuances, so there are various "bibles", various "apostles" and countless commentaries attempting to define, compare and contrast each under that vague heading.
At its core, though, despite the myths and misunderstandings, libertarianism is apolitical.
https://www.libertarianism.org/columns/scientism-myth-apolitical-pragmatism