Walsh, J. H. (1919). Walsh's business arithmetic. The Gregg Pub. Co..
Lua i Stíl Chicago (17ú heag.)Walsh, John H. Walsh's Business Arithmetic. New York : Boston [etc.]: The Gregg Pub. Co., 1919.
Lua MLA (8ú heag.)Walsh, John H. Walsh's Business Arithmetic. The Gregg Pub. Co., 1919.
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