Não informado. (1990). AEG news. Association of Engineering Geologists.
Chicago-viite (17. p.)Não informado. AEG News. Lawrence, Kan: Association of Engineering Geologists, 1990.
MLA-viite (8. p.)Não informado. AEG News. Association of Engineering Geologists, 1990.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.