Ayres, F. (1954). Schaum's outline of theory and problems of plane and spherical trigonometry. Schaum.
Citace podle Chicago (17th ed.)Ayres, Frank. Schaum's Outline of Theory and Problems of Plane and Spherical Trigonometry. Nueva York: Schaum, 1954.
Citace podle MLA (9th ed.)Ayres, Frank. Schaum's Outline of Theory and Problems of Plane and Spherical Trigonometry. Schaum, 1954.
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