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[2] D. Knuth, The METAFONT book, Addison Wesley, 1986-1992
[3] L. Lamport, LATEX: A Document Preparation System, Addison Wesley, 1985 (LATEX 2.09), 1994 (LATEX2ε)
[4] M. Goossens, F. Mittelbach & A. Samarin, The LATEX Companion, Addison Wesley, 1994
[5] M. Goossens, The XeTeX Companion, July 2009, http://xml.web.cern.ch/XML/lgc2/xetexmain.pdf
[6] D. J. Perry, Creating Scholarly Multilingual Documents Using Unicode, OpenType, and XeTeX, June 2009, http://scholarsfonts.net/xetextt.pdf