Reference resources can give a general overview or introduction to a topic, can provide definitions, and are useful for generating search terms.
Also, business reference resources are extremely important in providing a variety of data like statistics, historical charts, industry overviews, and company histories.
Books:
Online resources:
These resources are both useful and portable (you have access to them anywhere), and tend to be more authoritative then most content you'll find on the web
Enter a stock symbol, and choose "Financials" in the results
Recent 10-K reports can be found here as well
Search for company 10-K filings (you can also search Lexis Nexus, Yahoo! Finance, and others)
Useful for accounting ratios and principals
Use the search function and enter your ratio. Registration is free and provides access to all content
These entries are not authored by paid or scholarly contributors