Bailey, Rosemary. 2008. Design of Comparative Experiments.
Chang, Winston. 2018. R Graphics Cookbook. 2nd ed. O’Reilly Media.
Fisher, Ronald. 1935. The Design of Experiments. Oliver; Boyd.
National Commission for the Proptection of Human Subjects of Biomedical and Behavioral Research. 1978. “The Belmont Report: Ethical Principles and Guidelines for the Protection of Human Subjects of Research.” Distributed by ERIC Clearinghouse.
Wickham, H. 2010. “A Layered Grammar of Graphics.” Journal of Computational and Graphical Statistics: A Joint Publication of American Statistical Association, Institute of Mathematical Statistics, Interface Foundation of North America.
Wickham, Hadley. 2016. Ggplot2: Elegant Graphics for Data Analysis. Springer-Verlag New York.
Wilkinson, Leland. 2005. The Grammar of Graphics. Springer.