P. L . Delgado, D. S. Charney, L. H. Price, G. K. Aghajanian, H. Landis, G. R. Heninger (maj 1990). "Serotonin function and the mechanism of antidepressant action. Reversal of antidepressant-induced remission by rapid depletion of plasma tryptophan". Arch Gen Psychiatry. 47 (5): 411-418. PMID2184795.{{cite journal}}: CS1-vedligeholdelse: Flere navne: authors list (link)