Common Size, Trend, and Ratio Analysis by 
Stanford Guide to Financial Statements by Look within in Business Insights: Global
Use the Company Finder search (under the Companies tab in the top menu bar).
In the results list, you will see profile information. Public companies have a ticker symbol, the exchange, SIC and NAICS codes, and fiscal year will be noted.
Hint: If you have only one company and want to find another, use BI:Global to find the SIC/NAICS for the first company, then use the code in the Company search, in the appropriate search box. Doing that will yield a list of companies in the same industry.
Note to Mgt 469 students: Remember to pay attention about the stock exchange; you need to use companies that do not trade OTC.
WRDS provides access to selected datasets in the fields of finance, accounting, banking, economics, management, marketing, public policy and public health statistics. ACCESS: UC San Diego faculty, staff and students first must sign up for a WRDS account by using the Register link on the landing page. LIMITATIONS: Masters & Undergraduate students do not have access during summer or quarter breaks. UC San Diego affiliates without AD network accounts are ineligible for WRDS accounts (most Extension students are in this category). In those cases, Mergent Online and Global Financial Database are your recommended alternatives.
Secondary sources:
We have a couple online sourced that provide ratios, but they are limited in the number of companies they follow and/or the type of ratios they provide. However, if you are in those databases already, it may be simple to pull the ratios directly from them.
IBISWorld
When you do an industry search, and display the results, ratios are listed under the tab to the far right, "Key Statistics."
These resources provide background on understanding and using ratio analysis.
A fuller list of books about ratio analysis and financial statements can be seen by clicking the links; below are the selected "classics."
Financial Statement Analysis, 5th ed. by 
Financial Statement Analysis Workbook by 
Financial Ratios by 
Business Ratios and Formulas, 3rd ed. by 
Financial Statement Analysis by 
Rational investing with ratios : implementing ratios with enterprise value and behavioral finance by 
Key Management Ratios: the 100+ ratios every manager needs to know, 4th rev. ed. by 
The Meaning of Company Accounts by 
Analysing Financial Performance by 
Handbook of Business and Financial Ratios by 
