- [1] [CITE[山本弘のSF秘密基地]]
([TIME[2007-12-21 16:56:23 +09:00]] 版)
<http://homepage3.nifty.com/hirorin/bonotegami.htm>
-- 消滅確認 [TIME[2020-11-20T05:46:08.800Z]]
-- [CITE[山本弘のSF秘密基地]], [TIME[2020-11-20T05:45:58.000Z]], [TIME[2002-10-20T13:01:29.324Z]] <https://web.archive.org/web/20021020130128/http://homepage3.nifty.com/hirorin/bonotegami.htm>

[2] [CITE[x_bo.jpg (304×400)]]
([TIME[1999-05-13T14:14:34.000Z]], [TIME[2020-11-20T05:45:34.085Z]])
<http://www.asahi-net.or.jp/~qm4h-iim/x_bo.jpg>