Lua APA (7ú heag.)

ZILL, D. G., & DEWAR, J. M. (1990). Trigonometry.-- Ed.2. McGraw-Hill.

Lua i Stíl Chicago (17ú heag.)

ZILL, Dennis G., agus Jacqueline M. DEWAR. Trigonometry.-- Ed.2. New York: McGraw-Hill, 1990.

Lua MLA (9ú heag.)

ZILL, Dennis G., agus Jacqueline M. DEWAR. Trigonometry.-- Ed.2. McGraw-Hill, 1990.

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