In Search of Sasquatch by Kelly Milner Halls, Houghton Mifflin Books, Boston, MA, 2011.
This book doesn’t really answer the question as to whether Sasquatch is real. However it does lay out a pretty good case form footprints, to visual sightings, to lean-tos discovered. The best evidence is still the original Patterson-Gimlin film, as the proportions of the best filmed do not align with a human in a suit. It does appear that scientific study is getting closer to concluding that this is a real creature who is very shy, and very rarely seen; but often observes others, and leaves traces of its existence. There is also some evidence that they have a verbal language.