Calingasan, R. R. M. (2013). Trigonometry: A worktext. Anvil Publishing, Inc.
Lua i Stíl Chicago (17ú heag.)Calingasan, Recto Rex M. Trigonometry: A Worktext. Mandaluyong City: Anvil Publishing, Inc, 2013.
Lua MLA (9ú heag.)Calingasan, Recto Rex M. Trigonometry: A Worktext. Anvil Publishing, Inc, 2013.
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