APA (7th ed.) Citation

Williams, K. S., & Zhang Nan-yue. Evaluation of two trigonometric sums.

Chicago Style (17th ed.) Citation

Williams, Kenneth S., and Zhang Nan-yue. Evaluation of Two Trigonometric Sums.

MLA (9th ed.) Citation

Williams, Kenneth S., and Zhang Nan-yue. Evaluation of Two Trigonometric Sums.

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