Current official website:

https://www.leverageresearch.org/

Basic facts:

https://forum.effectivealtruism.org/posts/qYbqX3jX4JnTtHA5f/leverage-research-reviewing-the-basic-facts

Introduction to Leverage research by Lukeprog when asked by Geoff Anders in 2012:

https://www.lesswrong.com/posts/969wcdD3weuCscvoJ/introducing-leverage-research

Common knowledge posted in 2021:

https://www.lesswrong.com/posts/Kz9zMgWB5C27Pmdkh/common-knowledge-facts-about-leverage-research-1-0-1

Connection theory paper:

https://www.scribd.com/document/219774356/Evidence-for-Connection-Theory#download

Critics on Connection theory:

https://www.lesswrong.com/posts/8j4zirwfhWhT8nwsc/a-critique-of-leverage-research-s-connection-theory

Personal experience of Zoe Curzi (who was harmed by the research):