Gaya APA

Hostetler, R, P., LARSON, R, E. (1989). TRIGONOMETRY SECOND EDITION (2ND). Lexington, Massachusetts: D.C Heath and Company.

Gaya MLA

Hostetler, Robert, P.., LARSON, Roland, E.. "TRIGONOMETRY SECOND EDITION". 2ND Lexington, Massachusetts: D.C Heath and Company, 1989. Textbook.