Ayres, F. (1954). Schaum's outline of theory and problems of plane and spherical trigonometry. New York: McGraw-Hill Book Company.
Παραπομπή Chicago StyleAyres, Frank. Schaum's Outline of Theory and Problems of Plane and Spherical Trigonometry. New York: McGraw-Hill Book Company, 1954.
Παραπομπή MLAAyres, Frank. Schaum's Outline of Theory and Problems of Plane and Spherical Trigonometry. New York: McGraw-Hill Book Company, 1954.
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