Four types of quick references (small, portable packages of information) are described: slide rules, syntax summaries, informational guides, and posters and templates. Their design is discussed, covering the use of white space, type legibility, logical organization, inclusion of relevant information only, information accessibility, and effective headings.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>