Bennett, Everett A., and William Forrest Shonkwiler. Some Descendants of the Reverend Jacob Shonkwiler. Shonkwiler, 1979.
Swiger, Loraine B. Family Sketches of the Crabtrees of Southeast Ohio: Respectfully Dedicated to Elsie M. Crabtree Swiger (1863-1951). L.B. Swiger, 1986, FamilySearch Library, www.familysearch.org/library/books/viewer/580584/?offset=&return=1#page=1&viewer=picture&o=info&n=0&q=, Accessed 18 Apr. 2024.
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