Fumio Niwa should not be confused with the Yokohama balloonist of the same name who died on 11 January 1991 in an attempt to fly solo across the Pacific. About the other Fumio Niwa, cf. Japan Balloon AssociationArchived 20 February 2012 at the Wayback Machine, p.21 (Japanese)
kotobank.jp
"ペン部隊". Kotobank (in Japanese). Retrieved 24 July 2023.
web.archive.org
Fumio Niwa should not be confused with the Yokohama balloonist of the same name who died on 11 January 1991 in an attempt to fly solo across the Pacific. About the other Fumio Niwa, cf. Japan Balloon AssociationArchived 20 February 2012 at the Wayback Machine, p.21 (Japanese)
"読売文学賞" [Yomiuri Prize for Literature] (in Japanese). Yomiuri Shimbun. Archived from the original on 4 April 2019. Retrieved 26 September 2018.
yomiuri.co.jp
info.yomiuri.co.jp
"読売文学賞" [Yomiuri Prize for Literature] (in Japanese). Yomiuri Shimbun. Archived from the original on 4 April 2019. Retrieved 26 September 2018.