Ulrich, L.E.F., Nogueira, E.L., Teixeira, L.M., Ely, L.S., Filho, J.C.B. e Neto, A.C. 2013. Early versus late-onset major depression in the elderly: a comparative study. PAJAR - Pan-American Journal of Aging Research. 1, 1 (nov. 2013), 8–15.