ERIKSEN, A. (1985). Playground Design. Van Nostrand Reinhold.
Lua i Stíl Chicago (17ú heag.)ERIKSEN, Aase. Playground Design. Van Nostrand Reinhold, 1985.
Lua MLA (8ú heag.)ERIKSEN, Aase. Playground Design. Van Nostrand Reinhold, 1985.
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