APA (7th ed.) Citation

Reyes, F. N., & Felix, R. P. (1990). Trigonometry. National Book Store.

Chicago Style (17th ed.) Citation

Reyes, Fe N., and Rene P. Felix. Trigonometry. Metro Manila: National Book Store, 1990.

MLA (9th ed.) Citation

Reyes, Fe N., and Rene P. Felix. Trigonometry. National Book Store, 1990.