Ayers, F. (1954). Theory and problems of plane and spherical trignometry. McGraw-Hill.
Čikaški stil citiranjaAyers, Frank. Theory and Problems of Plane and Spherical Trignometry. New york: McGraw-Hill, 1954.
MLA način citiranjaAyers, Frank. Theory and Problems of Plane and Spherical Trignometry. McGraw-Hill, 1954.
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