Prushankin 2008,第238–239頁,原文:「Slack's original orders were to recruit within Missouri's Fifth CongressionalDistrict and that it was redesignated the Fourth
美國國會國家人物傳記大辭典中的傳記 由華盛頓郵報維護的投票記錄 智慧投票计划中的傳記、投票紀錄及利益集團評級 Congressional profile at GovTrack Congressional profile at OpenCongress Issue positions and quotes
National Atlas Printable District Maps Jeffrey B. Lewis; et al. Digital Boundary Definitions of United States Congressional Districts, 1789–2012. University