Spel

Homo ludens: a study of the play element in culture

Johan Huizinga.

Interactive play for children with autism

by Diana Seach.

The Genesis of Animal Play: Testing the Limits (Bradford Books)

Gordon M. Burghardt

Parent-child play: descriptions and implications

edited by Kevin MacDonald.

Knowledge under construction: the importance of play in developing children's spatial and geometric thinking activities

Daniel Ness And Stephen J. Farenga.

Children, play, and development

Fergus P. Hughes.

Play and Development: Evolutionary, Sociocultural, and Functional Perspectives (Jean Piaget Symposia Series)

Artin Göncü, Suzanne Gaskins

Play and Literacy in Early Childhood: Research From Multiple Perspectives

James F. Christie, Kathy Roskos

A Child's Work: The Importance of Fantasy Play

Vivian Gussin Paley

QuickSilver: adventure games, initiative problems, trust activities, and a guide to effective leadership

Karl Rohnke, Steve Butler ; Project Adventure, Inc.