General
War Powers Commission Report — This is the original resolution to replace the WPR with a War Powers Consultation Act. In the document, it refers to it as the 2009 legislation because that is when this original proposal was written, but it is basically the same legislation/concept that the proposal refers to.
The WPR: Concepts and practice
Ending perpetual war — This detailed review of the 1973 WPR argues that it won’t constrain modern warfare and needs to be updated to do so.