APA-referens (7:e uppl.)

Não informado. Techniques of Water Resources Investigations of the United States Geological Survey.

Chicago-referens (17:e uppl.)

Não informado. Techniques of Water Resources Investigations of the United States Geological Survey.

MLA-referens (8:e uppl.)

Não informado. Techniques of Water Resources Investigations of the United States Geological Survey.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.