Coriat, Isador H. (1911). "Psychasthenia.". Abnormal psychology. pp. 273–297. doi:10.1037/13768-014.
Walsh, James J. (1912). "Mental incapacity (psychasthenia).". Psychotherapy: Including the History of the Use of Mental Influence, Directly and Indirectly in Healing and the Principles for the Application of Energies Derived from the Mind to the Treatment of Disease. pp. 597–603. doi:10.1037/10544-093.