Juliano, L. M.; Griffiths, R. R. (2004). “A critical review of caffeine withdrawal: Empirical validation of symptoms and signs, incidence, severity, and associated features”. Psychopharmacology176 (1): 1–29. doi:10.1007/s00213-004-2000-x. PMID15448977.
Silverman K, Evans SM, Strain EC, Griffiths RR (October 1992). “Withdrawal syndrome after the double-blind cessation of caffeine consumption”. N. Engl. J. Med.327 (16): 1109–14. doi:10.1056/NEJM199210153271601. PMID1528206.
Juliano, L. M.; Griffiths, R. R. (2004). “A critical review of caffeine withdrawal: Empirical validation of symptoms and signs, incidence, severity, and associated features”. Psychopharmacology176 (1): 1–29. doi:10.1007/s00213-004-2000-x. PMID15448977.
Silverman K, Evans SM, Strain EC, Griffiths RR (October 1992). “Withdrawal syndrome after the double-blind cessation of caffeine consumption”. N. Engl. J. Med.327 (16): 1109–14. doi:10.1056/NEJM199210153271601. PMID1528206.