Mira, A., L. Farfallini, R. Baños, J. Bretón-López, and C. Botella. “Smiling Is Fun, an Online Intervention for the Prevention and Treatment of Emotional Disorders”. Psicodebate, Vol. 16, no. 2, Dec. 2016, pp. 51-72, doi:10.18682/pd.v16i2.597.