The key to a successful retirement is generating enough income from passive sources so that you no longer have to work to make money to cover your expenses. There are many possible sources of retirement income, including from a pension, social security, rental properties, and dividend stocks. 

Dividend stocks can be great sources of passive income for retirement. Three dividend stocks that have been passive income machines over the years are Getty Realty (NYSE: GTY), Rithm Capital (NYSE: RITM), and W. P. Carey (NYSE: WPC). Here's why three Fool.com contributors think that makes them great ways to help fund a retirement. 

Marc Rapport (Getty Realty): Funding a comfortable retirement typically requires a reliable income stream to supplement Social Security or other defined benefit plans that buttress your nest egg.

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Source Fool.com