Freilich, A., Ahanholt, H. H., & McCormack, J. p. Plane trigonometry.
Lua i Stíl Chicago (17ú heag.)Freilich, Aaron, Henry H. Ahanholt, agus Joseph páginas McCormack. Plane Trigonometry.
Lua MLA (8ú heag.)Freilich, Aaron, et al. Plane Trigonometry.
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