Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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