M. Z. Aguas da B. Beira, Helsinki, F. I. Finnish Na, Helsinki, F. I. Plancenter, Helsinki, F. I. F. I. N. N. I. D. A. -, and MZ, M. Ministerio,
“Beira water supply project : comprehensive training plan”. FINNIDA, Ministry of Foreign Affairs, Helsinki, Finland, p. 28 p. + 89 p. annexes, 1991.
T. S. Katko,
“Reselling and vending water”,
Journal American Water Works Association, pp. p. 63-69: fig., tab., photogr., 1991.