Wray , John L. “Archaeolithophyllum, and Abundant Calcareous Alga in Limestones of the Lansing Group (Pennsylvanian), Southeastern Kansas”. Bulletin (Kansas Geological Survey), no. 170, Jan. 1964, pp. 1-13, https://doi.org/10.17161/kgsbulletin.no.i170.22190.