The doctrine of triangles a history of modern trigonometry 著者: Van Brummelen, Glen

Available for University of the Philippines Diliman via IEEE Xplore. Click here to access
Also available remotely for University of the Philippines Diliman via IEEE Xplore. Click here to access thru EZproxy

Algebra and trigonometry 著者: Sullivan, Michael

Schaum's outline of precalculus 著者: Safier, Fred

Available for University of the Philippines Diliman via McGraw-Hill Access Engineering. Click here to access
Also available remotely for University of the Philippines Diliman via McGraw-Hill Access Engineering. Click here to access thru EZproxy

Precalculus functions & graphs 著者: Swokowski, Earl W.

Three-way journal writing effects on students' problem-solving and self-regulation skills in trigonometry 著者: Lugtu, Ivy C.

Precalculus functions and graphs 著者: Swokowski, Earl William 1926-, Cole, Jeffery A. (Jeffery Alan) 1955-

Schaum's outline of trigonometry 著者: Moyer, Robert, Ayres, Frank 1901-1994

Available for University of the Philippines Diliman via McGraw-Hill Access Engineering. Click here to access
Also available remotely for University of the Philippines Diliman via McGraw-Hill Access Engineering. Click here to access thru EZproxy

The fractional trigonometry with applications to fractional differential equations and science 著者: Lorenzo, Carl F., Hartley, Tom T.

A basic approach to precalculus trigonometry preparing to succeed in calculus 著者: Kim, Young H., Kim, Youngsoo, Tameru, Ana, Yan, Wen

Trigonometry 著者: Larson, Ron