(in Japanese)東京都のシンボルマークはイチョウではなかったArchived 2009-02-14 at the Wayback Machine (The symbol mark of the Tokyo Metropolis was not a ginkgo), from excite.co.jp, retrieved on September 29, 2008
(in Japanese)東京都のシンボルマークはイチョウではなかったArchived 2009-02-14 at the Wayback Machine (The symbol mark of the Tokyo Metropolis was not a ginkgo), from excite.co.jp, retrieved on September 29, 2008