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There are a few listed in this recent discussion - the one I'm familiar with, Martin A. Lee and Bruce Shlain's Acid Dreams: The CIA, LSD, and the Sixties Rebellion can be read on Erowid here.

That's specific to LSD and other drugs.

MKULTRA also extended into other spheres - there's a huge body of often-questionable work looking at this and related projects and their use of UFO research groups and conspiracy theory in manipulating public opinion. One of my favorites along those lines is Mark Pilkington's Mirage Men: An Adventure into Paranoia, Espionage, Psychological Warfare, and UFOs - which is written for the mass market, but is well-sourced.

The CIA themselves make documents available from FOIA searches in their "Electronic Reading Room". Of course, that is the CIA - anticipate lots of material, lots of reading-between lines. This pdf from a 1977 document might be a starting point - it's telling agency staffers how to respond to MKULTRA questions once the congressional hearings took place.