-"including the Public Library of Science project that I describe in the "
-"Afterword. It included a project to develop single nucleotide polymorphisms "
-"(SNPs), which are thought to have great significance in biomedical "
-"research. (That nonprofit project comprised a consortium of the Wellcome "
-"Trust and pharmaceutical and technological companies, including Amersham "
-"Biosciences, AstraZeneca, Aventis, Bayer, Bristol-Myers Squibb, Hoffmann-La "
-"Roche, Glaxo-SmithKline, IBM, Motorola, Novartis, Pfizer, and Searle.) It "
-"included the Global Positioning System, which Ronald Reagan set free in the "
-"early 1980s. And it included <quote>open source and free software.</quote>"
+"including the Public Library of Science project that I describe in chapter "
+"<xref xrefstyle=\"select: labelnumber\" linkend=\"c-afterword\"/>. It "
+"included a project to develop single nucleotide polymorphisms (SNPs), which "
+"are thought to have great significance in biomedical research. (That "
+"nonprofit project comprised a consortium of the Wellcome Trust and "
+"pharmaceutical and technological companies, including Amersham Biosciences, "
+"AstraZeneca, Aventis, Bayer, Bristol-Myers Squibb, Hoffmann-La Roche, "
+"Glaxo-SmithKline, IBM, Motorola, Novartis, Pfizer, and Searle.) It included "
+"the Global Positioning System, which Ronald Reagan set free in the early "
+"1980s. And it included <quote>open source and free software.</quote>"