| Sources |
- [S30] Missouri., Missouri, Buchanan County -- The St. Joseph News-Press NOW Newspaper (Online), (http://newspressnow.com:), "Huffman, Olyve J. 1931-2018," 13 December 2018, online archives (https://www.newspressnow.com/obituaries/huffman-olyve-j-1931-2018/article_2d1905d3-5e41-5b5e-8ed9-9b2994730bfd.html : accessed 26 Sep 2022). (Reliability: 3).
- [S353] Helena Cemetery (Andrew County, Missouri), Missouri, Andrew County -- Helena Cemetery (PACT), Nelson and irene Zimmerman marker, photographed by the PACT project. (Reliability: 3).
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