Robert J. Dinkin, Campaigning in America: A History of Election Practices (1989) onlineArquivado 30 de xuño de 2017 en Wayback Machine.
Nathaniel G. Pearlman, Margin of Victory: How Technologists Help Politicians Win Elections (2012) onlineArquivado 30 de xuño de 2017 en Wayback Machine.
web.archive.org
Robert J. Dinkin, Campaigning in America: A History of Election Practices (1989) onlineArquivado 30 de xuño de 2017 en Wayback Machine.
Nathaniel G. Pearlman, Margin of Victory: How Technologists Help Politicians Win Elections (2012) onlineArquivado 30 de xuño de 2017 en Wayback Machine.