Update books.md
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@@ -74,7 +74,6 @@ The following is a list of free, open source books on machine learning, statisti
 * [Introduction to Probability](http://athenasc.com/probbook.html) -  Book and course by MIT
 * [The Elements of Statistical Learning: Data Mining, Inference, and Prediction.](http://statweb.stanford.edu/~tibs/ElemStatLearn/) - Book
 * [An Introduction to Statistical Learning with Applications in R](http://www-bcf.usc.edu/~gareth/ISL/) - Book
-* [Learning Statistics Using R](http://health.adelaide.edu.au/psychology/ccs/teaching/lsr/)
 * [Introduction to Probability and Statistics Using R](https://cran.r-project.org/web/packages/IPSUR/vignettes/IPSUR.pdf) - Book
 * [Advanced R Programming](http://adv-r.had.co.nz) - Book
 * [Practical Regression and Anova using R](http://cran.r-project.org/doc/contrib/Faraway-PRA.pdf) - Book

The link for "Learning statistics using R" is invalid. I could not find a PDF link online. 