@book{1991-stallman ,note={URL: {\tt http://grosskurth.ca/\allowbreak bib/\allowbreak entries.html\#\allowbreak 1991/\allowbreak stallman}. Note: Edition 0.28 beta, last updated 23 September 1991 for {\tt make} version 3.61 beta and see also newer version $0} ,title={{GNU Make: a program for directing compilation}} ,booktitle={{GNU Make: a program for directing compilation}} ,author={Richard Stallman and Roland McGrath} ,publisher={Free Software Foundation} ,address={Boston} ,year={1991} }