

References:
Topic: Get RStudio Academic license
Web: https://www.rstudio.com/products/rstudio/download2/
File: Download RStudio – RStudio.pdf
Topic: RStudio Alternatives
Web: http://xmodulo.com/good-ide-for-r-on-linux.html
File: What is a good IDE for R on Linux - Xmodulo.pdf 
Web: http://stackoverflow.com/questions/1097367/what-ides-are-available-for-r-in-linux
File: What IDEs are available for R in Linux_ - Stack Overflow.pdf

References:
Topic: R installation
Guide:
R