एपीए उद्धरण

Survey, U. S. G. US Geological Survey circular. Washington, DC [u.a.].

शिकागो स्टाइल उद्धरण

Survey, United States Geological. US Geological Survey Circular. Washington, DC [u.a.].

एमएलए उद्धरण

Survey, United States Geological. US Geological Survey Circular. Washington, DC [u.a.].