Billings Geological Society. Field Conference. (1951). 2nd Annual Field Conference. The Society.
Chicago-referens (17:e uppl.)Billings Geological Society. Field Conference. 2nd Annual Field Conference. [Billings, Mont.: The Society, 1951.
MLA-referens (8:e uppl.)Billings Geological Society. Field Conference. 2nd Annual Field Conference. The Society, 1951.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.