I have blog posts on the following of his films:
Paths of Glory (1957)
Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1964)
2001: A Space Odyssey (1968)
Senses of Cinema has an article. FilmReference.com has many resources listed and says,
By steadily building a reputation as a filmmaker of international importance, he gained full artistic control over his films, guiding the production of each of them from the earliest stages of planning and scripting through post-production.