Ayres, F. (1954). Schaum's outline of theory and problems of plane and spherical trigonometry. Schaum.
Cita Chicago (17th ed.)Ayres, Frank. Schaum's Outline of Theory and Problems of Plane and Spherical Trigonometry. Nueva York: Schaum, 1954.
Cita MLA (9th ed.)Ayres, Frank. Schaum's Outline of Theory and Problems of Plane and Spherical Trigonometry. Schaum, 1954.
Atenció: Aquestes cites poden no estar 100% correctes.