Lawrence Frank & Robert Goldenson 
Understanding Children’s Play [PDF ebook] 

This is Volume X in a series of thirty-two on Developmental Psychology. Originally published in 1952. By presenting the play experiences of children within the framework of their living problems, this volume and its companion booklets will give to these adults who help shape their lives a fuller understanding of the significance of children’s play, and offer them valuable aids in fostering the development of productive, well-integrated human beings.