Hogan, P. (1974). Playgrounds for free: The utilization of used and surples materials in playground construction. MIT press.
Stile di citazione ChicagoHogan, Paul. Playgrounds for Free: The Utilization of Used and Surples Materials in Playground Construction. Cambridge: MIT press, 1974.
Citazione MLAHogan, Paul. Playgrounds for Free: The Utilization of Used and Surples Materials in Playground Construction. MIT press, 1974.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.