STEPHENS, R. T. (1977). Worktext in intermediate algebra. West Pub. Co.
Lua i Stíl Chicago (17ú heag.)STEPHENS, Robert T. Worktext in Intermediate Algebra. St. Paul: West Pub. Co, 1977.
Lua MLA (9ú heag.)STEPHENS, Robert T. Worktext in Intermediate Algebra. West Pub. Co, 1977.
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