Leatham, W.. "Conodont-based chronostratigraphy and conodont distribution across the Upper Ordovician western North American carbonate platform in the eastern Great Basin and a model for Ordovician-Silurian Genesis of the platform margin based ... /." Doctoral dissertation, Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487332636474718Chicago Manual of Style (17th edition)