International Congress on Carboniferous Stratigraphy and Geology & Heckel, P. H. (1979). Guidebook: Pennsylvanian cyclic platform deposits of Kansas and Nebraska : field trip no. 10, ninth International Congress of Carboniferous Stratigraphy and Geology, Urbana, Illinois, May 27-30, 1979. Kansas Geological Survey, University of Kansas.
Chicago Style (17th ed.) CitationInternational Congress on Carboniferous Stratigraphy and Geology and Philip H. Heckel. Guidebook: Pennsylvanian Cyclic Platform Deposits of Kansas and Nebraska : Field Trip No. 10, Ninth International Congress of Carboniferous Stratigraphy and Geology, Urbana, Illinois, May 27-30, 1979. Lawrence: Kansas Geological Survey, University of Kansas, 1979.
MLA (9th ed.) CitationInternational Congress on Carboniferous Stratigraphy and Geology and Philip H. Heckel. Guidebook: Pennsylvanian Cyclic Platform Deposits of Kansas and Nebraska : Field Trip No. 10, Ninth International Congress of Carboniferous Stratigraphy and Geology, Urbana, Illinois, May 27-30, 1979. Kansas Geological Survey, University of Kansas, 1979.