wire lines. The New York Times. 1952-09-24 [2013-12-19]. (原始内容存档于2013-12-20). Headstone put on L.I. grave of theNixons' dog Checkers. The New York Times
Gave Nixons Dog Known as Checkers. The New York Times. 17 May 2006 [16 May 2018]. Brozan, Nadine. Doug Coombs, 48, Skier, Dies in Accident. The New York
(原始内容存档于2009-03-06). Gilbert, Martin. The First World War: A complete history. Henry Holt and Co. 2004: 688. ISBN 0-8050-7617-4. Nixons Second Dispatch. 19141918
A Decorator for Nixons Gives Julie A Bit of Help. The New York Times. 1968-11-30. David, Lester. The Lonely Lady of San Clemente: The Story of Pat Nixon