Costa Galinha, I., C. R. Pereira, and F. Esteves. “Short-Form of the Portuguese Version of the Positive and Negative Affect Schedule - PANAS-Port-VRP: Confirmatory Factorial Analysis and Temporal Invariance”. PSICOLOGIA, vol. 28, no. 1, July 2014, pp. 53-65, doi:10.17575/rpsicol.v28i1.622.