The latter. The 4th volume of lamrim (by tsong-kha-pa) is a good summary with references to other books. That volume has been translated into English and us cal

The latter. The 4th volume of lamrim (by tsong-kha-pa) is a good summary with references to other books. That volume has been translated into English and us called "discerning the real" or something like that. Tsongkhapa gives a reference to a more detailed "manual" called "the 10 levels of sravakas", but that book hasn't been translated, although Max Muller made some initial sketches.