APA (7th ed.) Citation

Allen, N., & Key, T. (2000). The effects of diet on circulating sex hormone levels in men.

Chicago Style (17th ed.) Citation

Allen, N., and T. Key. The Effects of Diet on Circulating Sex Hormone Levels in Men. 2000.

MLA (9th ed.) Citation

Allen, N., and T. Key. The Effects of Diet on Circulating Sex Hormone Levels in Men. 2000.

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