Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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