Butts, William. "The role of excised tissues of the German cockroach Blattella germanica (linnaeus) (Orthoptera: Blattidae) in the epoxidation of heptachlor /." Doctoral dissertation, Ohio State University, 1964. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486565955105446Chicago Manual of Style (17th edition)