- Abel E. and Kruger M. (2010) Smile Intensity in Photographs Predicts Longevity, Psychological Science, 21, 542–544. – On smiling as helping us live longer.
- Béres, András, et al. ““Does happiness help healing?” Immune response of hospitalized children may change during visits of the Smiling Hospital Foundation’s Artists.” Orvosi hetilap 152.43 (2011): 1739-1744. – On smiling strengthening the immuse system.
- Ekman, Paul, Richard J. Davidson, and Wallace V. Friesen. “The Duchenne smile: Emotional expression and brain physiology: II.” Journal of personality and social psychology 58.2 (1990): 342. – On the initial facial research.
- Emoto, Masaru. The hidden messages in water. Simon and Schuster, 2011. – On how our thoughts affect us, as we’re 60% water.
- Federation of American Societies for Experimental Biology (FASEB). “Fight memory loss with a smile (or chuckle).” ScienceDaily. ScienceDaily, 27 April 2014. – On how smiling helps with memory loss.
- Hatfield, Elaine; Cacioppo, John T.; Rapson, Richard L. Clark, Margaret S. (Ed), (1992). Primitive emotional contagion. Emotion and social behavior. Review of personality and social psychology, Vol. 14., (pp. 151-177). Thousand Oaks, CA, US: Sage Publications, Inc, xi, 311 pp. – On smiling as infectious/contagious.
- Kraft, Tara L., and Sarah D. Pressman. “Grin and bear it: The influence of manipulated facial expression on the stress response.” Psychological science 23.11 (2012): 1372-1378. – On how faking a smile tricks the brain into believing you’re feeling good.
- O’Doherty, John, et al. “Beauty in a smile: the role of medial orbitofrontal cortex in facial attractiveness.” Neuropsychologia 41.2 (2003): 147-155. – On how facing someone smiling triggers the sense of feeling rewarded.
- Reis, Harry T., et al. “What is smiling is beautiful and good.” European Journal of Social Psychology 20.3 (1990): 259-267. – On smiling making us more attractive.
- R.D. (2000). Neural correlates of conscious emotional experience. In R.D. Lane & L. Nadel (Eds.), Cognitive neuroscience of emotion (pp. 345–370). New York: Oxford University Press. – On how smiling releases the “feel-good” neurotransmitters, specially endorphins, which act as painkillers.
- Seaward, Brian Luke. Managing stress: Principles and strategies for health and wellbeing. Jones & Bartlett Pub, 1999. – On smiling releasing the “feel-good” neurotransmitters, activating the release of neuropeptides.
- Sonnby–Borgström, M. (2002), Automatic mimicry reactions as related to differences in emotional empathy. Scandinavian Journal of Psychology, 43: 433–443 – On how we mimic and empathize when we see a facial expression.
- Sonkin, Daniel. “Mirroring People: The Science of Empathy and How We Connect With Others.” Partner Abuse 4.2 (2013): 287-291. – On smiling being contagious.
- Strack F, Martin LL, Stepper S. “Inhibiting and facilitating conditions of the human smile: a nonobtrusive test of the facial feedback hypothesis”. J Pers Soc Psychol. 1988 May;54(5):768-77. doi: 10.1037//0022-3514.54.5.768. PMID: 3379579. On how holding a pen with the mouth can contribute to feeling better.
- Tsai, Ya-Yun. “Is service with a smile enough? The effects of emotional labor on customer outcomes: The moderating roles of service sweethearting and customer-directed impression management.” (2014). – On how smiling contributes to a positive evaluation and feedback.
- Wild, Barbara, et al. “Why are smiles contagious? An fMRI study of the interaction between perception of facial affect and facial movements.” Psychiatry Research: Neuroimaging 123.1 (2003): 17-36. – On smiling as contagious.
Please email me references that you believe should be here included, this is a work-in-progress.