Clinton Heylin, All Yesterday's Parties: The Velvet Underground in Print 1966–1971 (2006)
Clinton Heylin compiles everything that was printed about the band in their short, mostly unnoticed, existence.
Richard Witts, Icons of Pop Music: The Velvet Underground (2006)
The Velvet Underground is given the academic treatment, but author Richard Witts manages to keep things readable and...witty.
Albin Zak III, The Velvet Underground Companion (1997)
Any hardcore fan, or music historian-in-utero, will find this compilation of four decades of commentary, reviews, and interviews with the band riveting.