J. Waterkeyn,
«Community mobilization : where is the entry point?»,
Waterlines, an international journal of water, sanitation and waste, pp. p. 2-4: ill., photogr., 1991.
T. Z. H. E. S. A. W. A. - Mwanza,
«HESAWA and gender awareness : participants manual». Health through Sanitation and Water (HESAWA), Mwanza, Tanzania, p. 33 p.: ill., fig., 1991.
N. G. N. E. S. T. - Ibadan,
Nigeria's threatened environment : a national profile. Ibadan, Nigeria: Nigerian Environmental Study / Action Team, 1991, p. vi, 288 p.: fig., photogr., tab.
M. H. A. Wegelin-Schuringa,
«On-site sanitation : building on local practice», vol. no. 16-E. IRC, The Hague, The Netherlands, p. 74 p.: fig., tab., 1991.