Subject
3 free books about laughter, free to read online. Chapter 1 of any book is free, no account needed.
Laughter: An Essay on the Meaning of the Comic
Henri Bergson
An Essay on Laughter: Its Forms, Its Causes, Its Development and Its Value
James Sully
Die Physiologie und Psychologie des Lachens und des Komischen. Ein Beitrag zur experimentellen Psychologie für Naturforscher, Philosophen und gebildete Laien.
Ewald Hecker
