Lasarenko, Kim. "A Style Change in Rachmaninoff's Piano Music as Seen in the Second Piano Sonata in B-Flat Minor, Opus 36 (1913 and 1931 Versions)." Doctoral dissertation, Ohio State University, 1988. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392292030Chicago Manual of Style (17th edition)