Priefert, E. Playgrounds and Recreation Spaces.
Lua i Stíl Chicago (17ú heag.)Priefert, Ernst. Playgrounds and Recreation Spaces.
Lua MLA (8ú heag.)Priefert, Ernst. Playgrounds and Recreation Spaces.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.