Calingasan, R. R. M. (2013). Trigonometry: A worktext. Anvil Publishing, Inc.
芝加哥风格引文Calingasan, Recto Rex M. Trigonometry: A Worktext. Mandaluyong City: Anvil Publishing, Inc, 2013.
MLA引文Calingasan, Recto Rex M. Trigonometry: A Worktext. Anvil Publishing, Inc, 2013.
警告：这些引文格式不一定是100％准确.