Não informado. (1990). AEG news. Association of Engineering Geologists.
Chicago-referens (17:e uppl.)Não informado. AEG News. Lawrence, Kan: Association of Engineering Geologists, 1990.
MLA-referens (8:e uppl.)Não informado. AEG News. Association of Engineering Geologists, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.