Proga, R. (1996). Arithmetic and algebra (4th.ed.). PWS.
Lua i Stíl Chicago (17ú heag.)Proga, Rosanne. Arithmetic and Algebra. 4th.ed. Boston: PWS, 1996.
Lua MLA (9ú heag.)Proga, Rosanne. Arithmetic and Algebra. 4th.ed. PWS, 1996.
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