ISO 8879:1986(E). Information processing -- Text and Office Systems -- Standard Generalized Markup Language (SGML). First edition -- 1986-10-15. [Geneva]: International Organization for Standardization, 1986.
Disponible à: http://www.iso.ch/cate/d16387.html
SGML archive at the University of Oslo, Norway. by Erik Naggum, 1996-03-01: "The SGML Repository is no longer actively maintained, and will remain as is for the foreseeable future."
Disponible à: ftp://ftp.ifi.uio.no/pub/SGML/