Ploeg, J.D. van der

van der Ploeg, J.D. & van Wijk-Sijbesma, C.A., 1980. Community participation in the rural well construction programme of Guinea-Bissau, The Hague, The Netherlands: IRC. Available at: https://fr.ircwash.org/sites/default/files/205.1-80CO-19197.pdf.