[1] [CITE@en[ISO 6709 - Wikipedia]]
([TIME[2020-02-19 09:21:44 +09:00]])
<https://en.wikipedia.org/wiki/ISO_6709>

[2] [CITE@ja[ISO 6709 - Wikipedia]]
([TIME[2020-02-15 04:42:14 +09:00]])
<https://ja.wikipedia.org/wiki/ISO_6709>

[3] [DFN[KS X ISO 6709:2008]]