Downing, D. (2010). Barron's E-Z trigonometry ([4th ed.].). Barron's Educational Series.
Chicago Style (17th ed.) CitationDowning, Douglas. Barron's E-Z Trigonometry. [4th ed.]. Hauppauge, N.Y.: Barron's Educational Series, 2010.
MLA引文Downing, Douglas. Barron's E-Z Trigonometry. [4th ed.]. Barron's Educational Series, 2010.
警告:這些引文格式不一定是100%准確.