Morán-Palma, Pedro. "Case studies on reproductive ecology of Lakeside daisy (Hymenoxys Herbacea = H. acaulis var. glabra), and evolution of weeds in sunflower (Helianthus annuus) /." Doctoral dissertation, Ohio State University, 1998. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487950658545339Chicago Manual of Style (17th edition)