Sijbesma, C. y Postma, L., «Quantification of qualitative data in the water sector: the challenges», Water international, pp. p. 150 - 161 : boxes, fig. tab., 2008.

Postma, L., Christoffers, T., y Stravato, L., «Rapport evaluation finale du programme EHA 26 novembre 2004 – 31 janvier 2005». IRC, Delft, The Netherlands, p. 69 p. : boxes, tab., 2005.

Postma, L., Getkate, R., y Wijk-Sijbesma, C.A. van, Life skills-based hygiene education : a guidance document on concepts, development and experiences with life skills-based hygiene education in school sanitation and hygiene education programmes., vol. 42. Delft, The Netherlands: IRC, 2004, p. xiv, 144 p. : 12 boxes, 1 fig., 10 tab.

Postma, L., James, A.J., Wijk, C. van, James, A.J., y Wijk, C. van, «QIS : a new participatory management tool to assess and act on field reality», in People-centred approaches to water and environmental sanitation : proceedings of the 30th WEDC Conference, Vientiane, Lao PDR, 25-29 October 2004 , 2004, pp. P. 345-348 : 1 box.

Bolt, E., Postma, L., y Karanja, B., «Measuring the effectiveness of hygiene promotion interventions», in Towards the millennium development goals - actions for water and environmental sanitation : proceedings of the 29th WEDC conference, Abuja, Nigeria, 2003, Loughborough, UK, 2003, pp. P. 6-8.

Wijk-Sijbesma, C.A. van y Postma, L., «MPA : a new methodology for participatory monitoring», Waterlines, an international journal of water, sanitation and waste, pp. p. 6-7 : 1 box, 2 fig., 2003.

Wijk-Sijbesma, C.A. van, Postma, L., y Otte, C., «Participatory quantification in the water and sanitation sector», vol. no. 47. International Institute for Environment and Development (IIED), London, UK, pp. p. 13 - 18; 1 box., 4 photogr., 2 tab., 2003.

Schouten, T., Postma, L., y Moriarty, P.B., «Scaling-up community management», in Towards the millennium development goals - actions for water and environmental sanitation : proceedings of the 29th WEDC conference, Abuja, Nigeria, 2003, Loughborough, UK, 2003, pp. p. 288-291.

Snel, M., Postma, L., y Phiri, C., «An effective approach for hygiene education : life skills», in People and systems for water, sanitation and health : proceedings of the 27th WEDC conference, Lusaka, Zambia, 2001, 2002, pp. P. 68-70 : 1 tab.

Smet, J.E.M., Postma, L., y Jahan, H., «Guidelines for the improvement of school sanitation. Part 1. From needs assessment to proposal for improvements of school sanitation and water supply (for non-drinking purposes)». IRC, Delft, The Netherlands, p. 36 p. + 43 p. annexes : fig., tab., techn.drwg., 2001.

Smet, J.E.M., Postma, L., y Jahan, H., «Guidelines for the improvement of school sanitation. Part 2. Implementation of school sanitation improvements». IRC, Delft, The Netherlands, p. 23 p. + 30 annexes (90 p.) : techn.drwg., 2001.

Smet, J.E.M., Postma, L., y Jahan, H., «Guidelines for the improvement of school sanitation. Part 3. Operation and maintenance of school sanitation». IRC, Delft, The Netherlands, p. 11 p., 2001.

Postma, L. y During, A., «Managing a small-scale piped water supply system as a business : part one: trainers notes». IRC, Delft, The Netherlands, p. iv, 55 p. : fig., photogr., 2001.

Postma, L., «Reference guide on water resources management». IRC and SNV Netherlands Development Organization, The Hague, The Netherlands, p. ca. 250 p., 2001.

Brikke, F., Postma, L., Moussa Campaore, L., Mar, L., Yaro, J., Djoukam, J., y Blanchet, F., «West Africa water programme : evaluation and advisory mission : final report. Pt. 1. Main report». PLAN International, Dakar, Senegal, p. xiii, 65 p., 2001.

Brikke, F. y Postma, L., «West Africa water programme : evaluation and advisory mission : final report. Pt 3. Background information». PLAN International, Dakar, Senegal, p. vi, 84 p., 2001.

Brikke, F., Postma, L., Moussa Campaore, L., Mar, L., Yaro, J., Djoukam, J., y Blanchet, F., «West Africa water programme : evaluation and advisory mission : final report. Pt 2. Country reports». PLAN International, Dakar, Senegal, p. v, 135 p., 2001.

Bolt, E., Snel, M., y Postma, L., «Challenges facing school sanitation and hygiene education from the perspective of the school teacher», Waterlines, an international journal of water, sanitation and waste, pp. p. 25-28 : 3 photogr., 2000.

Visscher, J.T., Bury, P.J., Moriarty, P.B., y Postma, L., «The Dublin Principles revisited for WSS», in Water, sanitation and hygiene : challenges of the millennium : proceedings of the 26th WEDC conference, Dhaka, Bangladesh, 2000, 2000, pp. P. 392-395 : 3 boxes.

Brikke, F., Postma, L., Traore, C., y Adini, A., «Evaluation finale du programme Saniya, Bobo Dioulasso, Burkina Faso : rapport final». IRC, Delft, The Netherlands, p. 82 p. : fig., tab., 2000.