Below you will find a series of bibliographies (pdf) with recommended reading, grouped according to topics:
Essentials – for students of Mindfulness and Buddhist Psychology
12 titles: Buddhist Background – Buddhist Psychology – Four Establishments of mindfulness
Early Buddhism and Early Buddhist Teachings
Early Buddhism: Translations of Canonical & Paracanonical Pali Texts
Other Early Indian Sources
Early Buddhism – Non-Pali texts
Academic literature
The following lists refer to academic literature on the study of early Buddhism and the study of early Buddhist developments:
Beginner’s Top Ten
Top Twenty Classics of Early Buddhism
Early Buddhist Reading: 100 titles
Early Buddhist Reading: Books only
Comparative Literature on Early Indian texts
Early Buddhist Texts – Comparative Literature
Buddhist India – Cultural History