Não informado. (2008). Sargent welch: Review of scientific apparatus. Sargent-Welch Scientific.
Lua i Stíl Chicago (17ú heag.)Não informado. Sargent Welch: Review of Scientific Apparatus. Skokie, Ill: Sargent-Welch Scientific, 2008.
Lua MLA (8ú heag.)Não informado. Sargent Welch: Review of Scientific Apparatus. Sargent-Welch Scientific, 2008.
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