Whatever your investment style or strategy, there's no denying that tried-and true dividend stocks can be a superb addition to any portfolio. Companies with an enviable track record of paying and increasing their dividends in all types of markets can both provide a safe haven for investors in market storms while maximizing portfolio returns over the long run. 

If you're on the hunt for unstoppable dividend stocks to invest in this month, don't overlook these two powerhouses for your buy list. 

Eli Lilly (NYSE: LLY) has an illustrious history of maintaining and raising its payout, combined with a diverse, profitable business, which creates a compelling buying proposition for long-term investors. The stock currently yields around 1.1% based on the current share price. 

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Source Fool.com