APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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