Benice, D. D. (1976). Precalculus algebra and trigonometry. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Benice, Daniel D. Precalculus Algebra and Trigonometry. Englewood Cliffs, N.J: Prentice-Hall, 1976.
Lua MLA (9ú heag.)Benice, Daniel D. Precalculus Algebra and Trigonometry. Prentice-Hall, 1976.
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