Não informado. (1990). AEG news. Association of Engineering Geologists.
Lua i Stíl Chicago (17ú heag.)Não informado. AEG News. Lawrence, Kan: Association of Engineering Geologists, 1990.
Lua MLA (8ú heag.)Não informado. AEG News. Association of Engineering Geologists, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.