Harraz, Fathalla. "Structural studies of natural products of Liriodendron tulipifera and Amphiachyris dracunculoides : I. Sesquiterpene lactones of Liriodendron tulipifera. II. Diterpene lactones of Amphiachyris dracunculoides /." Doctoral dissertation, Ohio State University, 1984. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487255963555785Chicago Manual of Style (17th edition)