Paul Hogan: Playgrounds for Free. The Utilization of Used and Surplus Materials in Playground Construction, The MIT Press, Cambridge, Massachusetts, and London, England, 1974.
Playgrounds for Free
The Playground Project Architektur für Kinder
architectures for children Spielplätze playgrounds aires de jeux legepladser lekplatser speelplaats speeltuin parques infantiles place zabaw espacio de juego детская площадка kënd lojërash