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為UTC-6調快一小時，即UTC-5（CDT）。 Hoffman. Geographic Names Information System. United States Geological Survey. Johnson County. Jim Forte Postal History. [2024-05-22]
[2022-05-21]. （原始内容存档于2022-05-28）. Hoffman. Geographic Names Information System. United States Geological Survey. Grant County. Jim Forte Postal History. [2015-06-18]
Surface Library. [October 27, 2008]. （原始内容存档于2013-07-08）. David Hoffman, Jim Hoffman; et al. Scientific Graphics Project. [April 24, 2006]. （原始内容存档于2006年7月3日）
TekRevue. October 15, 2014 [January 15, 2016]. （原始内容存档于2018-08-30）. Hoffman, Chris. Reduce Eye Strain and Get Better Sleep by Using f.lux on Your Computer
Ness 2002，第207頁. Bishop 1998，第81頁. Berndt 1993，第152頁. Yeide 2008，第40頁. Hoffman & Staary 2013，第149頁. Torriami & Dennis 2014，第45頁. Zaloga 1994，第36-37頁.