1. UCI. (1988). Iris data set. Available at http://archive.ics.uci.edu/ml/datasets/Iris/.
2. UCI. (2009). Wine quality data set. Available at https://archive.ics.uci.edu/ml/datasets/wine+quality.
3. Waskom, M. (2014). Seaborn dataset. Available at https://github.com/mwaskom/seaborn-data/blob/master/titanic.csv.