APA
Enriquez J. P. &. Y. S. E., . (2012). Plane trigonometry with focus on more practical applications in trigonometry. Philippines: Ymas Publishing House.
Chicago
Enriquez Jay P & Ymas Sergio E, . 2012. Plane trigonometry with focus on more practical applications in trigonometry. Philippines: Ymas Publishing House.
Harvard
Enriquez J. P. &. Y. S. E., . (2012). Plane trigonometry with focus on more practical applications in trigonometry. Philippines: Ymas Publishing House.
MLA
Enriquez Jay P & Ymas Sergio E, . Plane trigonometry with focus on more practical applications in trigonometry. Philippines: Ymas Publishing House. 2012.