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- Wikipedia, Louis K. Church, https://en.wikipedia.org/wiki/Louis_K._Church
- South Dakota State Historical Society (1997), The Private Letters of Governor Louis K. Church to President Grover Cleveland 1887-1889, https://www.sdhspress.com/journal/south-dakota-history-26-4/the-private-letters-of-governor-louis-k-church-to-president-grover-cleveland-1887-1889/vol-26-no-4-the-private-letters-of-governor-louis-k-church-to-president-grover-cleveland-1887-1889.pdf