Lawrence Pun (editor), Milkyway Image, Beyond Imagination -- Wai Ka-fai + Johhnie To + Creative Team (1996-2005) (Hong Kong: Joint Publishing, 2006), in English and in Chinese. Essays from foreign and Chinese scholars as well as cast and crew interviews.

- Interviews with Wai Ka-fai, Lau Ching-wan, Simon Yam, Cheng Siu-keung, Andy Lau, Chung Chi-wing, Lam Suet, Bruce Yu, Yau Nai-hoi and Johnnie To.

- Essays by David Bordwell, Peter Rist, Lawrence Pun, Chuck Stephens, Katherine Spring, Lorenzo Codelli, Li Cheuk-to, Jeff Smith, Bono Lee, Stephen Teo and Shu Kei.

Full content available here.

More details on this book here.

Stephen Teo, Director in Action: Johnnie To and the Hong Kong Action Film (Hong Kong: Hong Kong University Press, 2007). In English. See details on the book here. See book review here.

Michael Ingham, Johnnie To-Kei-fung's PTU (Hong Kong: Hong University Press, 2009). In English. See details on the book here and review here.