Lial, M. L. (1986). Algebra and trigonometry (4ª ed.). Scott, Foresman.
Lua i Stíl Chicago (17ú heag.)Lial, Margaret L. Algebra and Trigonometry. 4ª ed. Scott, Foresman, 1986.
Lua MLA (9ú heag.)Lial, Margaret L. Algebra and Trigonometry. 4ª ed. Scott, Foresman, 1986.
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