Maro, P. A. (1978). The small-scale manufacture of soap: An economic study. Tropical Products Institute.
Lua i Stíl Chicago (17ú heag.)Maro, Penelope A. The Small-scale Manufacture of Soap: An Economic Study. London: Tropical Products Institute, 1978.
Lua MLA (9ú heag.)Maro, Penelope A. The Small-scale Manufacture of Soap: An Economic Study. Tropical Products Institute, 1978.
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