Spanagel, D. I. (2014). DeWitt Clinton and Amos Eaton: Geology and power in early New York. The Johns Hopkins University Press.
Dyfyniad Arddull ChicagoSpanagel, David I. DeWitt Clinton and Amos Eaton: Geology and Power in Early New York. Baltimore, Maryland: The Johns Hopkins University Press, 2014.
Dyfyniad MLASpanagel, David I. DeWitt Clinton and Amos Eaton: Geology and Power in Early New York. The Johns Hopkins University Press, 2014.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.