Omura Yuko. Koreto taijiki. In Kaitei Shiseki shuran, XIII.
Oostrom, F. P. van. Het woord van eer: Literatuur aan het Hollandse hof omstreeks 1400. 3rd printing. Amsterdam: Meulenhoff, 1992.
Oostrom, F. P. van. Maerlants wereld. Amsterdam: Prometheus, 1996.
Ota Izumi no Kami Gyuichi. Shincho-Ko ki. Edited by Okuno Takahiro and Iwasawa Yoshihiko. Kadokawa Bunko 2541. Tokyo: Kadokawa Shoten, 1969.
Ota Izumi no Kami Gyuichi. Taikosama gunki no uchi, ed. Keio Gijuku Daigaku Fuzoku Kenkyujo Shido Bunko.Tokyo: Kyuko Shoin, 1975.
Oura Akio. Tettei kensho: Nobunaga koroshi no shinso. Tokyo: Shin Jinbutsu Oraisha, 1992.
Owada Tetsuo. Nobunaga shutsugenji no shui no jokyo. In Oda Nobunaga jiten, ed. Okamoto Ryoichi et al, 10–17.
Owada Tetsuo. Toyotomi Hideyoshi. Chuko Shinsho 784. 5th printing. Tokyo: Chuo Koronsha, 1992.
Oyudono no Ue no nikki, VI–VII. In Zoku Gunsho ruiju, supp. ser. 3. 3rd rev. ed. 6th printing. Tokyo: Zoku Gunsho Ruiju Kanseikai, 1987.
Oze Hoan. Taikoki. In Kaitei Shiseki shuran, VI. Tokyo: Kondo Kappanjo, 1900.
Oze Hoan. Shinchoki, ed. Kangori Amane. 2 vols. Koten Bunko 58 and 59. Tokyo, Gendai Shichosha, 1981.
Parker, Geoffrey. The Military Revolution: Military Innovation and the Rise of the West, 1500–1800. Cambridge: Cambridge University Press, 1988.
Perrin, Noel. Giving up the Gun: Japans Reversion to the Sword, 1543–1879. Boston: David R. Godine, 1979.
Polgár, László, SJ. Bibliographie sur lhistoire de la Compagnie de Jésus: 1901–1980. 6 vols. Rome: Institutům Historicum S.I., 1981–1990.
Ridolfi, Roberto. The Life of Niccold Machiavelli. Translated by Cecil Grayson. London: Routledge and Kegan Paul, 1963.
Robinson, G. W. Early Japanese Chronicles: The Six National Histories. In Historians of China and Japan, ed. W. G. Beasley and E. G. Pulleyblank, 212–228.
Robinson, G. W. and Beasley, W. G. Japanese Historical Writing in the Eleventh to Fourteenth Centuries. In Historians of China and Japan, ed. W. G. Beasley and E. G. Pulleyblank, 229–244.
Rodriguez, Joäo, SJ. Arte da lingoa de Iapam. Nagasaki: Collegio de Iapäo da Companhia de IESU, 1604–1608.
Rodriguez, Joäo, SJ. Arte breve da lingoa Japoa. Macao: Collegio da Madre de Deus da Companhia de IESU, 1620.
Rodriguez, Joäo, SJ. Arte da lingoa de iapam. Annotated Japanese translation by Doi Tadao, Nihon daibunten. Tokyo: Sanseido, 1955.
Rodriguez, Joäo, SJ. This Island of Jap on: Joäo Rodrigues Account of 16th-Century Japan. Translated by Michael Cooper, SJ. Tokyo and New York: Kodansha International, 1973.
Rohl, W. Das Goseibaishikimoku: Eine Rechtsquelle der Kamakura Zeit. In Oriens Extremus 5:228–245 (1958).
Rohl, W. Das Gesetz Takeda Shingens. In Oriens Extremus 6:210–235 (1959).
Ross, Andrew C. A Vision Betrayed: The Jesuits in Japan and China, 1542–1742. Edinburgh: Edinburgh University Press, 1994.
Ruiz-de-Medina, Juan (ed.). Documentos del Japón: 1547–1557.
Monumenta Historica Societatis lesu 137. Monumenta Missiorum Societatis lesu 52. Monumenta Historica Japoniae 2. Roma: Instituto Historico de la Compaňía de Jesús, 1990.
Ruiz-de-Medina, Juan (ed.). Documentos del Japón: 1558–1562.
Monumenta Historica Societatis lesu 148. Monumenta Missiorum Societatis lesu 61. Monumenta Historica Japoniae 3. Roma: Instituto Historico de la Compaňía de Jesds, 1995.
Sakamoto Taro. Rikkokushi. Nihon Rekishi Sosho 27. Tokyo: Yoshikawa Kobunkan, 1970.
Sakamoto Taro. The Six National Histories of Japan. Translated by John S. Brownlee. Vancouver/Tokyo: UBC Press/University of Tokyo Press, 1991.
Sakuma gunki. In Zoku Gunsho ruiju, XX.B. 3rd. rev. ed. Tokyo: Zoku Gunsho Ruiju Kanseikai, 1958.
Sansom, George. A History of Japan. 1334–1615. London: Cresset Press, 1961.
Sasaki Junnosuke. Nobunaga ni okeru "gaibun" to "tenká" ni tsuite. In Niigata shigaku 8:1–11 (1975).
Sassa Katsuaki. Oda Nobunaga. Tokyo: Shin Jinbutsu Oraisha, 1992.
Sato Shinichi. Kao о yomu. Heibonsha Sensho 124. Tokyo: Heibonsha, 1988.
Schutte, Josef Franz, SJ. Valignanos Missionsgrundsätze fur Japan, I. Band I. Teil: Das Problem (1573–1580). Rome: Edizioni di Storia e Letteratura, 1951. I. Band II. Teil: Die Losung (1580–1582). Rome: Edizioni di Storia e Letteratura, 1958.
