(1979). Nature In Cities. John Wiley.
Lua i Stíl Chicago (17ú heag.)Nature In Cities. John Wiley, 1979.
Lua MLA (8ú heag.)Nature In Cities. John Wiley, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)