Cita APA (7th ed.)

Calingasan, R. R. M. (2013). Trigonometry: A worktext. Anvil Publishing, Inc.

Cita Chicago (17th ed.)

Calingasan, Recto Rex M. Trigonometry: A Worktext. Mandaluyong City: Anvil Publishing, Inc, 2013.

Cita MLA (9th ed.)

Calingasan, Recto Rex M. Trigonometry: A Worktext. Anvil Publishing, Inc, 2013.