This directory contains the source for refer and several other programs associated with it. The refer subdirectory contains source for the newest version of refer, which has been extensively modified from the original V7 version. The major visible changes are a new style of citations (e.g. Jones and Smith, 1971; White et. al, 1980) with the -m option, and improved error messages. It requires minor changes to the refer macros; the -ms and -me macro packages on this tape have these changes already. There are also major internal changes to reduce refer's size and increase its robustness. Refer requires either separate I/D (use makefile) or overlays (use ovmakefile). The util directory contains source for mkey, hunt, inv, etc., which are used by the lookbib and pubindex scripts. There are also sources for the original V7 version of refer, without any bug fixes.