References
- Hand, D. (2016). Measurement: A very short introduction. Oxford, UK: Oxford University Press.
- Kammerer, J. (1990). Largest rivers in the United States. Reston, VA: U.S. Geological Survey. Retrieved from https://pubs.usgs.gov/of/1987/ofr87-242/
- Krantz, D., Luce, R., Suppes, P., & Tversky, A. (1971). Foundations of measurement (Vol. 1). New York: Academic Press.