[1] ハウランド島 - Wikipedia (7/12/2017, 10:59:47 AM) <https://ja.wikipedia.org/wiki/%E3%83%8F%E3%82%A6%E3%83%A9%E3%83%B3%E3%83%89%E5%B3%B6>

[2] Howland Island - Wikipedia (7/26/2017, 6:10:12 AM) <https://en.wikipedia.org/wiki/Howland_Island>