1. Milstein Randall L. (1988). The Calvin 28 structure: evidence for impact origin . Can. J. Earth Sci., Vol.25, No.9, P.1524-1530
  2. Milstein Randall L. (1988). The Calvin 28 cryptoexplosive disturbance, Cass County, Michigan: evidence for impact opigin . LPI Contrib., No.676, P. 122-123
  3. Hodge, Paul W., (1994). Meteorite craters and impact structures of the Earth. Cambridge University Press , 122 p.
  4. Milstein Randall L. (1997). The Calvin impact structure, Cass County, Michigan: identification and analysis of a subsurface Ordovician astrobleme . Oklahoma Geological Survey, No.100, P. 391-393
  5. Brady Robert V. (2002). A comparison of two possible astroblemes in southern Michigan: The ordovician age Calvin and reading cryptoexplosive structure . Mich. Acad., Vol.34, No.1, P. 39
  6. Jarmo Moilanen (2004). References.
  7. John G. Spray, Director PASSC (2005). Impact Structures listed by Name. Current total number of confirmed impact structures: 172 .
  8. Osinski Gordon R. (2006). The geological record of meteorite impacts. 40th ESLAB First International Conference on Impact Cratering in the Solar System, 8-12 May 2006., Noordwijk,The Netherlands


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