Ayres, F. J. (1954). Schaum's outline of theory and problems of plane and spherical trigonometry. McGraw Hill.
استشهاد بنمط شيكاغوAyres, Frank Junior. Schaum's Outline of Theory and Problems of Plane and Spherical Trigonometry. New York: McGraw Hill, 1954.
MLA استشهادAyres, Frank Junior. Schaum's Outline of Theory and Problems of Plane and Spherical Trigonometry. McGraw Hill, 1954.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.