A standard history of Jasper and Newton counties, Indiana, Lewis Publishing Company, , 345 p. (lire en ligne)
books.google.com
Ade, John, Newton County: A Collection of Historical Facts and Personal Recollections Concerning Newton County, Indiana, from 1853 to 1911, Bobbs-Merrill, , 195 p. (lire en ligne)
postalhistory.com
« Newton County », Jim Forte Postal History (consulté le )