References/Notes/Attributions:
Source
The data were obtained from Belsley, Kuh and Welsch (1980). They in turn obtained the data from Sterling (1977).
References
Sterling, Arnie (1977) Unpublished BS Thesis. Massachusetts Institute of Technology.
Belsley, D. A., Kuh. E. and Welsch, R. E. (1980) Regression Diagnostics. New York: Wiley.