Gay, H. (1938). Computation and trigonometry. The Macmillan.
Lua i Stíl Chicago (17ú heag.)Gay, H.J. Computation and Trigonometry. New York: The Macmillan, 1938.
Lua MLA (9ú heag.)Gay, H.J. Computation and Trigonometry. The Macmillan, 1938.
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