NANNEY, J., & CABLE, J. L. (1979). Trigonometry: A skills approach. Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)NANNEY, J.Louis, agus John L. CABLE. Trigonometry: A Skills Approach. Boston: Allyn and Bacon, 1979.
Lua MLA (9ú heag.)NANNEY, J.Louis, agus John L. CABLE. Trigonometry: A Skills Approach. Allyn and Bacon, 1979.
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