Your primary care doctor can provide a reference, if you need one.
American Psychological Association.Delusion.APA Dictionary of Psychology.
Harvard Medical School.Delusional disorder.Harvard Health Publishing.
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Mental Health America.Paranoia And delusional disorders.
American Psychiatric Association.Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR).
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Opjordsmoen S.Delusional disorder as a partial psychosis.Schizophr Bull.
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Texas A&M University.Delusional disorder.