Ayres, F. (1954). Theory & problems of Trigonemetry. Schaum Pub. Co.
Chicago-čujuhus (17. p.)Ayres, Frank. Theory & Problems of Trigonemetry. New York: Schaum Pub. Co, 1954.
MLA-čujuhus (9. p.)Ayres, Frank. Theory & Problems of Trigonemetry. Schaum Pub. Co, 1954.
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