World Bank. Transportation, Water and Telecommunications Dept, & Kalbermatten, J. M. (1980). Appropriate technology for water supply and sanitation. Transportation, Water and Telecommunication Dept., World Bank.
Lua i Stíl Chicago (17ú heag.)World Bank. Transportation, Water and Telecommunications Dept, agus John M. Kalbermatten. Appropriate Technology for Water Supply and Sanitation. Washington, D.C.: Transportation, Water and Telecommunication Dept., World Bank, 1980.
Lua MLA (8ú heag.)World Bank. Transportation, Water and Telecommunications Dept, agus John M. Kalbermatten. Appropriate Technology for Water Supply and Sanitation. Transportation, Water and Telecommunication Dept., World Bank, 1980.
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