Cohen, S., & Williamson, G. (1988). Perceived stress in a probability sample
of the United States. In S. Spacapan & S. Oskamp (Eds.), The social
psychology of health: Claremont symposium on applied social psychology
(pp. 31-67). Sage publication
The original PSS-14 (1983) is available at: https://doi.org/10.2307/2136404.
This version is adapted from https://www.das.nh.gov/wellness/docs/percieved%20stress%20scale.pdf