(Inggris) George J Siegel, Bernard W Agranoff, R Wayne Albers, Stephen K Fisher, dan Michael D Uhler. (1999). Basic Neurochemistry - Molecular, Cellular and Medical Aspects - The Neuropeptides. Edward Hines Jr Veterans Affairs Hospital, Loyola University Chicago Stritch School of Medicine, University of Michigan, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Mental Health Research Institute (edisi ke-6). Lippincott-Raven. ISBN0-397-51820-X. Diakses tanggal 2010-07-19.Pemeliharaan CS1: Banyak nama: authors list (link)