http://isgs.illinois.edu/harold-r-wanlesshttp://archives.library.illinois.edu/uasfa/1511024.pdfhttp://gsabulletin.gsapubs.org/content/74/4/437.abstracthttp://university-discoveries.com/university-of-illinois-urbana-champaignhttp://isgs.illinois.edu/publications?combine=&field_publication_author_value=wanless&field_publicaton_year_value=&title=http://eas2.unl.edu/~tfrank/History%20on%20the%20Rocks/Nebraska%20Geology/Paleozoic%20Webpage/Cyclothems.htmhttp://www.aapg.org/about/petroleum-geology/geology-and-petroleum/sedimentology-and-stratigraphyhttp://bulletin.geoscienceworld.org/content/abull/43/4/1003.full.pdfhttp://bulletin.geoscienceworld.org/content/abull/47/8/1177.full.pdfftp://rock.geosociety.org/pub/Memorials/v02/Wanless-HR.pdf

http://the-earth-story.com/post/99912976722/cyclothems-our-last-post-showed-the-persian-gulf