Bauer, George N.
Plane and spherical trigonometry
D.C. Heath, 1932
 Buku Teks
Davis, Hannibal Albert
Brief course in plane and spherical trigonometry
American Book, 1933
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Nelson, Alfred L.
Plane and spherical trigonometry
Harper & Brothers Publishing, 1943
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Rice, Bernard J.
Plane trigonometry
Prindle, Weber & Schmidt, 1975
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Buchanan, Herbert E.
Plane trigonometry
Johnson Pub., 1926
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