Engelsohn, Harold S.
Trigonometry: a complete and concrete approach / Harold S. Engelsohn
McGraw-Hill, 1981
Buku Teks
Nanney, J. Louis
Algebra and trigonometry: a skills approach
Allyn and Bacon, 1980
Buku Teks
Kuechle, Richard T.
Trigonometry : a New approach
Wadsworth, 1984
Buku Teks
Dwyer, David
College algebra and trigonometry : a contemporary approach
Brooks/Cole, 2000
Buku Teks
Cohen, David
Precalculus : a problems-oriented approach : interactive video skillbuilder CD
Thomson, 2006
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