van der Zwaard, Roy; Polak, Machiel A. (2001). "Pseudohallucinations: A pseudoconcept? A review of the validity of the concept, related to associate symptomatology". Comprehensive Psychiatry. 42 (1): 42–50. doi:10.1053/comp.2001.19752. PMID11154715.
van der Zwaard, Roy; Polak, Machiel A. (2001). "Pseudohallucinations: A pseudoconcept? A review of the validity of the concept, related to associate symptomatology". Comprehensive Psychiatry. 42 (1): 42–50. doi:10.1053/comp.2001.19752. PMID11154715.