USO/IEC Standard 9945-1:1996, ``Information Technology -Portable Operating System Interface (POSIX) Part 1: System Application Program Interface (API) [C Language]'', Institute of Electrical and Electronic Engineers, 1996.
FSU_Pthreads, M. Frank, http://www.cs.fsu.edu/~mueller/projects.html
Clthreads, P. Krauz ftp://lin.fsid.cvut.cz/pub/linux/clthreads/clthreads-0.1.1.tgz
LinuxThreads, X. Leroy, http://pauillac.inria.fr/~xleroy/linuxthreads
Pcthreads, M. T. Peterson. http://www.aa.net/~mtp/Pcthreads.html
Provenzano threads, C. A. Provenzano http://www.mit.edu:8001/~people/proven/pthreads.html