APA (7th ed.) Citation

Salem lhLionel, Salem, & Testard. The most beautiful mathematical formula.

Chicago Style (17th ed.) Citation

Salem lhLionel, Salem, and Testard. The Most Beautiful Mathematical Formula. New York lbJohn Wiley and Sons lc1992.

MLA (9th ed.) Citation

Salem lhLionel, et al. The Most Beautiful Mathematical Formula.

Warning: These citations may not always be 100% accurate.