Olney, E. (1880). Elements of trigonometry, plane and spherical. Sheldon & Company.
Chicagoスタイル(17版)引用形式Olney, Edward. Elements of Trigonometry, Plane and Spherical. New York: Sheldon & Company, 1880.
MLA(8版)引用形式Olney, Edward. Elements of Trigonometry, Plane and Spherical. Sheldon & Company, 1880.
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