Não informado. (1973). Plastics Engineering. Society of Plastics Engineers.
Lua i Stíl Chicago (17ú heag.)Não informado. Plastics Engineering. Brookfield, CT: Society of Plastics Engineers, 1973.
Lua MLA (8ú heag.)Não informado. Plastics Engineering. Society of Plastics Engineers, 1973.
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