Title: One boy's day; a specimen record of behavior
Description: This is a ground breaking book in the history of psychology.  Barker and Wright, professors at the University of Kansas, were students of Carl Lewin.  They decided that the current system of cataloging and analyzing behavior were inadequate, especially when applied in vivo.  This little book is a gem, and catalogs an intermediate step to their development of Behavior Setting Theory, one of the of the most important ways of understanding the interaction of the environment and people.
Subjects: Child study, Child psychology, Child development