References
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Grolemund, G., and H. Wickham. 2011. “Dates and Times Made Easy with lubridate.” Journal of Statistical Software 40 (3). http://www.jstatsoft.org/v40/i03/paper.
Kaplan, Daniel. 2015. Data Computing: An Introduction to Wrangling and Visualization with R. Project Mosaic Books.
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Yau, Nathan. 2013. Data Points: Visualization That Means Something. Wiley.