Ayres, F. (1954). Schaum's Outline of Theory and Problems of Plane and Spherical Trigonometry. New York: McGraw-Hill.
Dyfyniad Arddull ChicagoAyres, Frank. Schaum's Outline of Theory and Problems of Plane and Spherical Trigonometry. New York: McGraw-Hill, 1954.
Dyfyniad MLAAyres, Frank. Schaum's Outline of Theory and Problems of Plane and Spherical Trigonometry. New York: McGraw-Hill, 1954.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.