R. E. Black, Yeager, B. A. C., Lanata, C. F., Lazo, F., and 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., and 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.