“Book format” for programs includes a table of contents, indexes (various cross-reference lists), chapters containing related procedures and functions, paragraphs separated by blank lines, sentences (horizontal statement-sequences), and font distinctions such as boldface function calls. This paper should interest everyone responsible for presentation of programs or for programming style standards. One vital issue the authors do not address is what technology is proposed to allow convenient updating of “book format” programs. Printing on paper could entail major reprints for minor changes, but online bit-mapped presentation could accommodate their “book format.”