* Kendall, Kathleen E. "Communication in the Presidential Primaries: Candidates and the Media, 1912–2000" (2000)* "Primaries: Open and Closed"* Palmer, Niall A.
* Праймериз Демократической партии США (2008)* Kendall, Kathleen E. "Communication in the Presidential Primaries: Candidates and the Media, 1912—2000" (2000)* "Primaries: Open and Closed"* Palmer, Niall A.