1. Parker Gay S.(Jr) (1995). "Haswell hole", a previously unknown impact structure in southeast Colorado . Symposium on "Ames Structure in Northwest Oklahoma and Similar Features: Origin and Petroleum Production", Norman, Okla, March 28-29; Oklahoma Geological Survey, Circ. - 1997. - N 100, P. 272-276
  2. Gay S.Parker (1996). "Haswell hole", a previously unknown impact structure in southeast Colorado . SEG/DENVER'96: SEG Int. Expo. and 66th Annu. Meet., Denver, Colo, Nov. 10-15 - Vol. 2. , Tulsa (Okla), P. 1923
  3. D. Rajmon (2009).


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