Cita APA

Cowen, P., Parry-Billings, M., & Newsholme, E. (1989). Decreased plasma tryptophan levels in major depression.

Citación estilo Chicago

Cowen, P., M. Parry-Billings, and E. Newsholme. Decreased Plasma Tryptophan Levels in Major Depression. 1989.

Cita MLA

Cowen, P., et al. Decreased Plasma Tryptophan Levels in Major Depression. 1989.

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