Martin, Marsha. "Interrelationships between Pratylenchus penetrans, P. crenatus, and Verticillium dahliae, and their effects on Solanum tuberosum cv. superior in field microplots /." Doctoral dissertation, Ohio State University, 1981. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487156013005822Chicago Manual of Style (17th edition)