PAPPIN, C. (1972). Computational arithmetic ( complete course ). Glencoe Press.
Lua i Stíl Chicago (17ú heag.)PAPPIN, Charlene. Computational Arithmetic ( Complete Course ). London: Glencoe Press, 1972.
Lua MLA (9ú heag.)PAPPIN, Charlene. Computational Arithmetic ( Complete Course ). Glencoe Press, 1972.
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