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[techreport] ISO. Standard Generalized Markup Language. ISO 8879:1985. International Organization for Standardization. Geneva. ISO 8879. 1985.

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[book] Eve Maler and Jeanne el Andaloussi. Developing SGML DTDs. from Text to Model to Markup. Developing DTDs. Prentice-Hall. Upper Saddle River, NJ. 1999. 0-13-309881-8.

[article] “More About Custom DTDs”. W3C. https://alistapart.com/article/customdtds2/. A List Apart. 17 May 2005. 1534-0295.

[inproceedings] “Your Standard Average Document Grammar”. Not just not your average standard. Peter Flynn. https://www.balisage.net/Proceedings/vol19/html/Flynn01/BalisageVol19-Flynn01.html. Balisage. Balisage 2017. 2017. Rockville, MD. . Balisage Series om Markup Technologies. Rockville, MD. 1947-2609.

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