Salmen, L. F. (1983). Participant-observer evaluation of urban projects in La Paz, Bolivia and Guayaquil, Ecuador. Water Supply and Urban Development Department, Operations Policy Staff, World Bank.
Lua i Stíl Chicago (17ú heag.)Salmen, Lawrence F. Participant-observer Evaluation of Urban Projects in La Paz, Bolivia and Guayaquil, Ecuador. New York: Water Supply and Urban Development Department, Operations Policy Staff, World Bank, 1983.
Lua MLA (9ú heag.)Salmen, Lawrence F. Participant-observer Evaluation of Urban Projects in La Paz, Bolivia and Guayaquil, Ecuador. Water Supply and Urban Development Department, Operations Policy Staff, World Bank, 1983.
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