"皇居の儀装馬車について~" [About the Imperial Palace Ceremonial Carriages]. National Gardens Association – Kokyo Gaien National Garden (in Japanese). October 31, 2016. Retrieved July 9, 2025.
"皇居へ行ってみよう" [Let's go to the Imperial Palace]. Kunai-chō. Archived from the original on January 9, 2018. Retrieved January 2, 2018. [The Imperial Palace ... is approximately 1,150,000 m2 in size, or about 6,000,000 times the size of the Tokyo Dome. In addition to the palace where His Majesty the Emperor conducts his business, the Imperial Palace includes the Imperial Household Agency building and the East Gardens.]
"皇居へ行ってみよう" [Let's go to the Imperial Palace]. Kunai-chō. Archived from the original on January 9, 2018. Retrieved January 2, 2018. [The Imperial Palace ... is approximately 1,150,000 m2 in size, or about 6,000,000 times the size of the Tokyo Dome. In addition to the palace where His Majesty the Emperor conducts his business, the Imperial Palace includes the Imperial Household Agency building and the East Gardens.]