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| Howard, J. Michael (2007) Bulletin Vol. 23, Mineral Species of Arkansas - A Digest (2nd ed.) Arkansas Geological Commission |
| Rocks & Minerals Vol. 70, No. 4, p.256 |
| Goldstein, Alan (2006) Kentucky Mineral: Locality Index. Rocks & Minerals, 81 (6) 420-440 doi:10.3200/rmin.81.6.420-440 Mineralogical Record, v. 28, n. 6, 1997 |
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| www.rkci.org (2008) http://www.rkci.org/library/gsp/engle.htm |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. Smith, Arthur E. (1991) Texas Mineral Locality Index. Rocks & Minerals, 66 (3) 196-224 doi:10.1080/00357529.1991.11761622 |
| Craig, J.R., Howie, D.A., Harris, R.L. Kullurud, G. [sic] & Bryan, W. B. (1971). The Ashmore: a new olivine-bronzite chondrite. Meteoritics 6(1): 33-37. (March 1971). |
US highway 27 roadcut, Halls Gap, Lincoln County, Kentucky, USA