Nielsen, M.

van der Hoek, W. et al., 2001. Childhood diarrhea and hygiene : mothers' perceptions and practices in the Punjab, Pakistan, (Working paper / IWMI No. 25) Colombo, Sri Lanka: International Water Management Institute (IWMI). Available at: https://es.ircwash.org/sites/default/files/Nielsen-2001-Childhood.pdf.