-
geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:831615
-
www.newcastlenebraska.com/ (18 Feb 2010)
-
www.newcastlenebraska.com/history.html (18 Feb 2010)
-
en.wikipedia.org/wiki/Newcastle,_Nebraska (13 Jun 2010)
-
geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:2399491