"[A]rguably the most influential psychiatrist of the twentieth century" in: Lane, Christopher (2008). Shyness: How Normal Behavior Became a Sickness. Yale University Press. p. 6. ISBN978-0-300-14317-1. and "without question, one of the most influential psychiatrists of the twentieth century" in: Spiegel, Alix (January 3, 2005). "The Dictionary of Disorder". The New Yorker. Condé Nast. Retrieved February 10, 2011. and "has been justly called one of the most influential psychiatrists of the twentieth century" in Angell, Marcia (July 14, 2011). "The Illusions of Psychiatry". Vol. 58, no. 12. The New York Review of Books.
"[A]rguably the most influential psychiatrist of the twentieth century" in: Lane, Christopher (2008). Shyness: How Normal Behavior Became a Sickness. Yale University Press. p. 6. ISBN978-0-300-14317-1. and "without question, one of the most influential psychiatrists of the twentieth century" in: Spiegel, Alix (January 3, 2005). "The Dictionary of Disorder". The New Yorker. Condé Nast. Retrieved February 10, 2011. and "has been justly called one of the most influential psychiatrists of the twentieth century" in Angell, Marcia (July 14, 2011). "The Illusions of Psychiatry". Vol. 58, no. 12. The New York Review of Books.
Manea, Laura L (01/2015). "A diagnostic meta-analysis of the Patient Health Questionnaire-9 (PHQ-9) algorithm scoring method as a screen for depression.". General Hospital Psychiatry (ISSN0163-8343), 37 (1), p. 67.