D. M. Ritchie and K. L. Thompson, "QED Text Editor", MM-70-1373-3Arxivat 2015-02-03 at Archive-It (June 1970), reprinted as "QED Text Editor Reference Manual", MHCC-004, Murray Hill Computing, Bell Laboratories (October 1972).
bell-labs.com
cm.bell-labs.com
D. M. Ritchie and K. L. Thompson, "QED Text Editor", MM-70-1373-3Arxivat 2015-02-03 at Archive-It (June 1970), reprinted as "QED Text Editor Reference Manual", MHCC-004, Murray Hill Computing, Bell Laboratories (October 1972).