Safier, Fred
Schaum's outlines theory and problems of precalculus
McGraw-Hill, 2009
Buku Teks
Nanney, J. Louis
Trigonometry : a skills approach, lecture version
Allyn and Bacon, 1980
Buku Teks
Engelsohn, Harold S.
Trigonometry: a complete and concrete approach / Harold S. Engelsohn
McGraw-Hill, 1981
Buku Teks
Gibilisco, Stan, 1953-
Trigonometry demystified
McGraw-Hill, 2012
Buku Teks
Taylor, Howard E.
Contemporary trigonometry
McGraw-Hill, 1973
Buku Teks