STEIN, S. K., & CRABILL, C. D. (1976). Algebra II: Trigonometry. W.H.Freeman and co.
Lua i Stíl Chicago (17ú heag.)STEIN, Sherman K., agus Calvin D. CRABILL. Algebra II: Trigonometry. San Francisco: W.H.Freeman and co, 1976.
Lua MLA (9ú heag.)STEIN, Sherman K., agus Calvin D. CRABILL. Algebra II: Trigonometry. W.H.Freeman and co, 1976.
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