Geological Society of America & Legget, R. F. (1982). Geology under cities. Geological Society of America.
Lua i Stíl Chicago (17ú heag.)Geological Society of America agus Robert Ferguson Legget. Geology Under Cities. Boulder, Colo.: Geological Society of America, 1982.
Lua MLA (8ú heag.)Geological Society of America agus Robert Ferguson Legget. Geology Under Cities. Geological Society of America, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.