Update program.Rmd (#984)

* Update program.Rmd

Book links do not work as of now. I replaced the links that can direct viewers to the right sites!

* Link to online versions

Co-authored-by: Mine Çetinkaya-Rundel <cetinkaya.mine@gmail.com>
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@ -50,13 +50,12 @@ Learning more about programming is a long-term investment: it won't pay off imme
To learn more you need to study R as a programming language, not just an interactive environment for data science.
We have written two books that will help you do so:
- [*Hands on Programming with R*](https://amzn.com/1449359019), by Garrett Grolemund.
- [*Hands on Programming with R*](https://rstudio-education.github.io/hopr/), by Garrett Grolemund.
This is an introduction to R as a programming language and is a great place to start if R is your first programming language.
It covers similar material to these chapters, but with a different style and different motivation examples (based in the casino).
It's a useful complement if you find that these four chapters go by too quickly.
- [*Advanced R*](https://amzn.com/1466586966) by Hadley Wickham.
- [*Advanced R*](https://adv-r.hadley.nz/) by Hadley Wickham.
This dives into the details of R the programming language.
This is a great place to start if you have existing programming experience.
It's also a great next step once you've internalised the ideas in these chapters.
You can read it online at <http://adv-r.had.co.nz>.