UNIX for People is a 1985 printing of a book that first appeared in 1982, which makes it more interesting in a sense. It aimed to teach people how to use BSD UNIX, but now it can also tell us quite a lot about the history of computing.
The subtitle spells out the curriculum: “a modular guide to the UNIX operating system: visual editing, document preparation, & other resources”. Birns, Brown, and Muster spend most of the 500 pages on vi, nroff, troff, the file system, and the shell, broken into modules so a reader can jump to the part that matters.
John Muster is the author who stayed with the subject. He taught UNIX at UC Berkeley Extension, went on to write UNIX Made Easy and Introduction to Unix and Linux, and spent years running Muster Learning Architects in Berkeley. Birns and Brown never published another book, so the trio’s only collaboration is also the last most readers hear of two of them.