Out, D., Granger, D., Sephton, S., & Segerstrom, S. (2013). Disentangling sources of individual differences in diurnal salivary α-amylase: reliability, stability and sensitivity to context. Psychoneuroendocrinology, 38(3), 367-75. https://doi.org/10.1016/j.psyneuen.2012.06.013