R. E. Black, Yeager, B. A. C., Lanata, C. F., Lazo, F., y Verastegui, H.,
«Transmission factors and socioeconomic status as determinants of diarrhoeal incidence in Lima, Peru»,
Journal of diarrhoeal diseases research, pp. p. 186-193: 5 tab., 1991.
R. E. Black, Adair, L. S., Akin, J. S., Guilkey, D. K., Popkin, B. M., Flieger, W., y Briscoe, J.,
«Underlying and proximate determinants of child health : the Cebu longitudinal health and nutrition study»,
American journal of epidemiology, pp. P. 185-201: fig., tab., 1991.