Gabelli discusses valuation-private market value.

http://blogs.cfainstitute.org/insideinvesting/2013/02/16/a-conversation-with-mario-gabelli/

Just remember to place private market valuations into context. Would you have followed Internet buy-outs and mergers over the cliff during the heady– and absurdly easy credit days–of the Internet glory days, 1995 to 2000? Buyouts also are helped by ample bank credit.

Hello Ruby Tuesday , Restaurant Valuation (Cove Street Capital)

Do your own work then compare and contrast: RT-Presentation