Jones, M. Tim (2008). GNU/Linux application programming (2nd utg.). Hingham, Mass.: Charles River Media. s. 253. ISBN978-1-58450-568-6. «The 2.6 kernel utilizes the new Native POSIX Thread Library, or NPTL (introduced in 2002), which is a higher performance implementation with numerous advantages over the older component.»
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LinuxThreads on FreeBSD «Arkivert kopi». Arkivert fra originalen 8. august 2014. Besøkt 6. august 2014.
web.archive.org
LinuxThreads on FreeBSD «Arkivert kopi». Arkivert fra originalen 8. august 2014. Besøkt 6. august 2014.