S, KATZ; FORD A B; MOSKOWITZ R W; JACKSON B A; JAFFE M W (1963). «Studies of Illness in the Aged». Journal of the American Medical Association185 (12): 914-9. PMID14044222. doi:10.1001/jama.1963.03060120024016.
S, KATZ; FORD A B; MOSKOWITZ R W; JACKSON B A; JAFFE M W (1963). «Studies of Illness in the Aged». Journal of the American Medical Association185 (12): 914-9. PMID14044222. doi:10.1001/jama.1963.03060120024016.