Welton, J. (1917). Groundwork of logic. W.B. Clive, University Tutorial Press.
Lua i Stíl Chicago (17ú heag.)Welton, James. Groundwork of Logic. London: W.B. Clive, University Tutorial Press, 1917.
Lua MLA (8ú heag.)Welton, James. Groundwork of Logic. W.B. Clive, University Tutorial Press, 1917.
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