While the proven Zacks Rank places an emphasis on earnings estimates and estimate revisions to find strong stocks, we also know that investors tend to develop their own individual strategies. With this in mind, we are always looking at value, growth, and momentum trends to discover great companies.Of these, value investing is easily one of the most popular ways to find great stocks in any market environment. Value investors use a variety of methods, including tried-and-true valuation metrics, to find these stocks.On top of the Zacks Rank, investors can also look at our innovative Style Scores system to find stocks with specific traits. For example, value investors will want to focus on the "Value" category. Stocks with high Zacks Ranks and "A" grades for Value will be some of the highest-quality value stocks on the market today.One stock to keep an eye on is Capital One (COF). COF is currently sporting a Zacks Rank of #2 (Buy) and an A for Value.We should also highlight that COF has a P/B ratio of 1.05. The P/B ratio is used to compare a stock's market value with its book value, which is defined as total assets minus total liabilities. This stock's P/B looks attractive against its industry's average P/B of 1.06. COF's P/B has been as high as 1.24 and as low as 0.56, with a median of 1.04, over the past year.Finally, we should also recognize that COF has a P/CF ratio of 4.52. This metric focuses on a firm's operating cash flow and is often used to find stocks that are undervalued based on the strength of their cash outlook. This company's current P/CF looks solid when compared to its industry's average P/CF of 5.14. Over the past year, COF's P/CF has been as high as 9.82 and as low as 4.52, with a median of 6.71.Value investors will likely look at more than just these metrics, but the above data helps show that Capital One is likely undervalued currently. And when considering the strength of its earnings outlook, COF sticks out at as one of the market's strongest value stocks. Tech IPOs With Massive Profit Potential: Last years top IPOs surged as much as 299% within the first two months. With record amounts of cash flooding into IPOs and a record-setting stock market, this year could be even more lucrative. See Zacks’ Hottest Tech IPOs Now >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Capital One Financial Corporation (COF): Free Stock Analysis Report To read this article on Zacks.com click here.