\bib{1979/-bell}
\yr 1979
\book UNIX time-sharing system: UNIX programmers manual, seventh edition, volumes 1, 2A, 2B
\publ Bell Telephone Laboratories
\publaddr Murray Hill, New Jersey
\also reprinted as \cite{1983/-bell-1} and \cite{1983/-bell-2}
\url http://cm.bell-labs.com/7thEdMan/
\endref
