diff --git a/website/docs/resources/readings.md b/website/docs/resources/readings.md
index ac782f6..d5edc7a 100644
--- a/website/docs/resources/readings.md
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@@ -265,5 +265,7 @@
   [*Statistics and the Theory of Measurement*](http://www.lps.uci.edu/~johnsonk/CLASSES/MeasurementTheory/Hand1996.StatisticsAndTheTheoryOfMeasurement.pdf).
 - Judea Pearl.
   [*Causal inference in statistics: An overview*](http://ftp.cs.ucla.edu/pub/stat_ser/r350.pdf).
+- Judea Pearl.
+  [*Understanding Simpson’s Paradox*](https://ftp.cs.ucla.edu/pub/stat_ser/r414.pdf).
 - Yehuda Lindell and Benny Pinkas.
   [*Secure Multiparty Computation for Privacy-Preserving Data Mining*](https://eprint.iacr.org/2008/197.pdf).