Tham khảo Ogata_Kōan

  1. ↑ Rubinger, Richard (2014). Private Academies of the Tokugawa Period. Princeton University Press. tr. 128. ISBN 0691613958.
  2. ↑ O'Malley, Charles Donald (1968). The History of Medical Education: An International Symposium..., Volume 673. University of California Press. tr. 408.
  3. ↑ Finn, Dallas: Meiji Revisited: The Sites of Victorian Japan, page 6. Weatherhill, 1995.