APA (7th ed.) Citation

Anderson, I., Parry-Billings, M., Newsholme, E., Poortmans, J., & Cowen, P. (1990). Decreased plasma tryptophan concentration in major depression: Relationship to melancholia and weight loss.

Chicago Style (17th ed.) Citation

Anderson, I., M. Parry-Billings, E. Newsholme, JR Poortmans, and P. Cowen. Decreased Plasma Tryptophan Concentration in Major Depression: Relationship to Melancholia and Weight Loss. 1990.

MLA (9th ed.) Citation

Anderson, I., et al. Decreased Plasma Tryptophan Concentration in Major Depression: Relationship to Melancholia and Weight Loss. 1990.