Take a look at Lippincott's Datapoints blog post What's it worth to you? Company Valuation Resources for an overview of available resources.

Use the Ibbotson Cost of Capital Yearbook, available at the Lippincott Library Reference Desk at call number HC110 C3 C678.

Also, see Business Valuations by Industry, the most recent edition of which is held at the Lippincott Library Reference Desk at call number HG4028.V3 B78.

Take a look at the Business Reference Guide, held at call number HD1393.25 B87 at the Lippincott Library Reference Desk.

For more information on business valuation, check out Common Approaches for Determining Business Value from Inc. magazine.