STEINLAGE, R. C. (1981). College algebra and trigonometry. Goodyear Pub. Co.
Lua i Stíl Chicago (17ú heag.)STEINLAGE, Ralph C. College Algebra and Trigonometry. California: Goodyear Pub. Co, 1981.
Lua MLA (9ú heag.)STEINLAGE, Ralph C. College Algebra and Trigonometry. Goodyear Pub. Co, 1981.
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