Answer

Refer to the NYU Business Library Company/Financial page and consult these recommended databases: 

Mergent BondViewer: includes Fitch, Moody's and S&P ratings for individual bond issues on the synopsis page for the bond.

Standard & Poor's NetAdvantage: Credit Ratings are available by typing a company name or ticker, e.g. Apple or AAPL, in the search box. In the left tool bar of the results, go to Fixed Income then select Credit Ratings. 

Capital IQ: Credit Ratings are available by typing a company name or ticker, e.g. Apple or AAPL, in the search box. In the left tool bar of the results, go to Fixed Income then select Credit Ratings. 

Use Bloomberg (see Bloomberg Guide).

• Type the ticker symbol of the company you want, hit the yellow <CORP> key, then type CRPR and hit . Bonds are listed by Bloomberg composite ratings.
• To access ratings from Fitch, Moody's or Standard & Poor's on the terminal, type the ticker symbol, hit the F8 Equity key, type CRPR, and hit the green <Go> key. e.g. Pepsico: PEP< EQUITY> CRPR < GO >
• To access ratings on a specific bond, type ticker, F3 Corp button, hit <GO>, select a bond listed, type DES in the command line, and hit <GO>
• Bloomberg also offers its own proprietary rating which can be found using the DRSK function. For Pepsico: PEP < EQUITY > DRSK < GO >.

Library Bloomberg terminals are located in Bobst Library on the 5th floor Research Commons.