Koski, Anthony. "The effects of timing of nitrogen application on quality, carbohydrate status, root growth, and thatch accumulation in 'Baron' Kentucky bluegrass (Poa pratensis L.) /." Doctoral dissertation, Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487267024996817Chicago Manual of Style (17th edition)