Schaum's outline of trigonometry per 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

Schaum's outline of trigonometry per 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

Eigenvalues, embeddings and generalised trigonometric functions per Lang, Jan

Available for University of the Philippines Diliman via SpringerLink. Click here to access

Essentials of trigonometry. per Davis, E. Allan

Six-figure tables of trigonometric functions per Khrenov, L.S

Circular functions per School Mathematics Study Group

Natural trigonometric functions to seven decimal places for every ten seconds of arc together with miscellaneous tables per Ives, Howard Chapin

Elementary functions for precalculus mathematics per Glenview, Ill. Phillips, Esther R. c1978, Rose, Israel H.