Taylor, Howard E.
Contemporary trigonometry
McGraw-Hill, 1973
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Hackert, Adelbert F.
Elements of trigonometry
D.C. Health, 1971
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Harmon, Frank L.
Modern college trigonometry
Dickenson, 1996
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Nanney, J. Louis
Trigonometry : a skills approach, lecture version
Allyn and Bacon, 1980
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Engelsohn, Harold S.
Trigonometry: a complete and concrete approach / Harold S. Engelsohn
McGraw-Hill, 1981
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