Ayalon, L., Gum, A. M., Feliciano, L., & Arean, P. A. (2006). Effectiveness of nonpharmacological interventions for the management of neuropsychiatric symptoms in patients with dementia: a systematic review. Archives of Internal Medicine, 166(20), 2182-2188. doi: 10.1001/archinte.166.20.2182