H. P. Haug and Hack, H.,
“Training modules for waterworks personnel in developing countries”. Deutsche Gesellschaft fur Technische Zusammenarbeit (GTZ), Eschborn, Germany, p. 3 boxes (44 modules): fig., 1987.
M. F. Fde Lima e Costa, Magalhaes, M. H. A., Rocha, R. S., Antunes, C. M. F., and Katz, N.,
“Water-contact patterns and socioeconomic variables in the epidemiology of schistosomiasis mansoni in an endemic area in Brazil”,
Bulletin of the World Health Organization, pp. p. 57-66: fig., tab., 1987.