How to Identify Counterfeit Money: 15 Steps (with Pictures) - wikiHow
Counterfeit money - Wikipedia
How to Spot Counterfeit Money | Personal Finance | U.S. News
The Most Counterfeit-Proof Currencies - Investopedia
7 commonly counterfeited currencies - Marketplace
How to Spot Fake Money - Investopedia
4 Ways to Detect Counterfeit US Money - wikiHow
Counterfeit United States currency - Wikipedia
How Counterfeiting Works - HowStuffWorks