Kaufman, L. (2014, February 5). In texting era, crisis hotlines put help at youths’ fingertips. The New York Times, p. A1.
181
Olds, J. (1956). Pleasure centers in the brain. Scientific American, 195(4),105–116.
Olds, J., & Milner, P. (1954). Positive reinforcement produced by electrical stimulation of septal area and other regions of rat brain. Journal of Comparative Physiological Psychology, 47(6), 419–427.
