[1] SGMLguid - Wikipedia (2017-09-04 02:49:20 +09:00) https://en.wikipedia.org/wiki/SGMLguid

[2] Re: The Origin of Blockquote (Liam R. E. Quin著, 2017-08-29 06:33:58 +09:00) https://lists.w3.org/Archives/Public/public-webhistory/2017Aug/0002.html

[3] Re: Provenance of the blockquote element (Dan Connolly著, 2017-09-12 03:29:29 +09:00) https://lists.w3.org/Archives/Public/public-webhistory/2017Sep/0000.html

[4] 関連: hn, HTML 1991