Não informado. (2018). Research Report S. U.S. Army Engineer Waterways Experiment Station.
Chicago-referens (17:e uppl.)Não informado. Research Report S. Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 2018.
MLA-referens (8:e uppl.)Não informado. Research Report S. U.S. Army Engineer Waterways Experiment Station, 2018.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.