added reference

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Peli de Halleux 2016-11-04 08:18:43 -07:00
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@ -34,3 +34,8 @@ Make a @boardname@ wallet with this guided tutorial!
Let's get started!
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## References
The wallet built in this activity is inspired from the duct tape wallet in
[A Kid's Guide to Awesome Duct Tape Projects: How to Make Your Own Wallets, Bags, Flowers, Hats, and Much, Much More!](https://www.amazon.com/gp/product/1629148016)