1. 1
    Kana kohitsu no naiyōteki kenkyū /
    仮名古筆の內容的研究 /
    by Kyūsojin, Hitaku, 1909-
    Published 1980
    Book
  2. 2
    Shin kokin to sono zengo /
    新古今とその前後 /
    by Fujihira, Haruo, 1923-
    Published 1983
    Book