Investopedia has a short tutorial on Ratio Analysis which has basics and sources of information as does Fuld & Company , a Competitive Intelligence consulting. Investopedia has a nice listing of some of the more common ratios and a nice dictionary of financial statement terms. These peer review tools don't necessarily go company by company but some do. The RMA, D&B, Leo Troy, and IRS sources look by industry, either SIC/NAICS or their own industry breakdown. Other tools like the paid area of Hoover's is more flexible and will allow for more individually company comparisons. If you are looking for books about Ratio Analysis the best LC subject heading is "Ratio Analysis." There are general sources that cross the industries, but there are also some sources specific to a particular industry (some are listed below).