Geological Society of America North Central Section. (1987). North-Central Section of the Geological Society of America.
Chicago-Zitierstil (17. Ausg.)Geological Society of America North Central Section. North-Central Section of the Geological Society of America. Boulder, Colo, 1987.
MLA-Zitierstil (9. Ausg.)Geological Society of America North Central Section. North-Central Section of the Geological Society of America. 1987.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.