en O. M. Anaheim, K. Moksnes, P. C. Borchgrevink, S. Kaasa, O. Dale (august 2008). „Clinical pharmacology of methadone for pain”. Acta Anaesthesiologica Scandinavica. 52 (7): 879–889. doi:10.1111/j.1399-6576.2008.01597.x. PMID18331375.Mentenanță CS1: Nume multiple: lista autorilor (link)
en D. C. Kraychete, R. K. Sakata (iulie 2012). „Use and rotation of opioids in chronic non-oncologic pain”. Revista brasileira de anestesiologia. 62 (4): 554–562. doi:10.1016/S0034-7094(12)70155-1. PMID22793972.
en S. Mercadante, E. Bruera (martie 2016). „Opioid switching in cancer pain: From the beginning to nowadays”. Critical reviews in oncology/hematology. 99: 241–248. doi:10.1016/j.critrevonc.2015.12.011. PMID26806145.
en W. Leppert (). „The role of methadone in cancer pain treatment - a review”. International Journal of Clinical Practice. 63 (7): 1095–1109. doi:10.1111/j.1742-1241.2008.01990.x. PMID19570126.
en R. Chou, D. B. Gordon, O. A. de Leon-Casasola; et al. (februarie 2016). „Management of Postoperative Pain: A Clinical Practice Guideline From the American Pain Society, the American Society of Regional Anesthesia and Pain Medicine, and the American Society of Anesthesiologists' Committee on Regional Anesthesia, Executive Committee, and Administrative Council”. The Journal of Pain. 17 (2): 131–157. doi:10.1016/j.jpain.2015.12.008. PMID26827847.Mentenanță CS1: Utilizare explicită a lui et al. (link) Mentenanță CS1: Nume multiple: lista autorilor (link)
en O. M. Anaheim, K. Moksnes, P. C. Borchgrevink, S. Kaasa, O. Dale (august 2008). „Clinical pharmacology of methadone for pain”. Acta Anaesthesiologica Scandinavica. 52 (7): 879–889. doi:10.1111/j.1399-6576.2008.01597.x. PMID18331375.Mentenanță CS1: Nume multiple: lista autorilor (link)
en D. C. Kraychete, R. K. Sakata (iulie 2012). „Use and rotation of opioids in chronic non-oncologic pain”. Revista brasileira de anestesiologia. 62 (4): 554–562. doi:10.1016/S0034-7094(12)70155-1. PMID22793972.
en S. Mercadante, E. Bruera (martie 2016). „Opioid switching in cancer pain: From the beginning to nowadays”. Critical reviews in oncology/hematology. 99: 241–248. doi:10.1016/j.critrevonc.2015.12.011. PMID26806145.
en W. Leppert (). „The role of methadone in cancer pain treatment - a review”. International Journal of Clinical Practice. 63 (7): 1095–1109. doi:10.1111/j.1742-1241.2008.01990.x. PMID19570126.
en R. Chou, D. B. Gordon, O. A. de Leon-Casasola; et al. (februarie 2016). „Management of Postoperative Pain: A Clinical Practice Guideline From the American Pain Society, the American Society of Regional Anesthesia and Pain Medicine, and the American Society of Anesthesiologists' Committee on Regional Anesthesia, Executive Committee, and Administrative Council”. The Journal of Pain. 17 (2): 131–157. doi:10.1016/j.jpain.2015.12.008. PMID26827847.Mentenanță CS1: Utilizare explicită a lui et al. (link) Mentenanță CS1: Nume multiple: lista autorilor (link)