Mendoza Quiñones, R., et al. “Scale for Assessing Perceptual Anomalies. Validation of a Spanish Version of the SIAPA Scale in a Sample of Cuban Schizophrenic Patients”. Actas Españolas De Psiquiatría, vol. 35, no. 1, Jan. 2007, pp. 15-19, https://actaspsiquiatria.es/index.php/actas/article/view/331.