Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Refer is a program for managing bibliographic references, and citing them in troff documents. It is implemented as a troff preprocessor. refer was written by Mike E. Lesk at Bell Laboratories in or before 1978, and is now available as part of most Unix-like operating systems. A free reimplementation exists as part of the groff package. troff can trace its origins back to a text formatting program called RUNOFF, written by Jerome H. Saltzer for MIT's CTSS operating system in the mid-1960s. (The name allegedly came from the phrase at the time, I'll run off a document.)

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