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Klok MD, Jakobsdottir S, Drent ML. The role of leptin and ghrelin in the regulation of food intake and body weight in humans: a review. Obesity Reviews. January 2007, 8 (1): 21–34. PMID 17212793. doi:10.1111/j.1467-789x.2006.00270.x.
Raffin-Sanson ML, de Keyzer Y, Bertagna X. Proopiomelanocortin, a polypeptide precursor with multiple functions: from physiology to pathological conditions. European Journal of Endocrinology. August 2003, 149 (2): 79–90. PMID 12887283. doi:10.1530/eje.0.1490079.
Klok MD, Jakobsdottir S, Drent ML. The role of leptin and ghrelin in the regulation of food intake and body weight in humans: a review. Obesity Reviews. January 2007, 8 (1): 21–34. PMID 17212793. doi:10.1111/j.1467-789x.2006.00270.x.