P. Morgan,
«Ecosan at low cost - with the potential of upgrading»,
Waterlines, an international journal of water, sanitation and waste, pp. p. 6-7 : 3 photogr., 2007.
P. Morgan,
«Lessons from a low cost ecological approach to sanitation in Malawi». Water and Sanitation Program - African Region, Nairobi, Kenya, p. 12 p. : 2 boxes, photogr., 1 tab., 2007.