Some useful ratio analysis tools. Analysis without Paralysis is a great overview of business analysis generally with a clear, concise chapter on ratio analysis. You can get it from library reserves and borrow for two hours. The calculators help you understand how ratios are formulated and whether they are a percentage, whole number etc. Basic but useful if you are beginning to develop your skills in this area for the first time.
Business industry information and reports including industry financial ratios, balance sheets, and detailed profit and loss statements. Also covers some hard-to-find small businesses that don't exist as large industries.