National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). (2012). Questions and Answers about Polymyalgia Rheumatica and Giant Cell Arteritis. US Dept of Health and Human Services, National Institutes of Health, National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). NIH Publication No. 12–4908. Retrieved 2/2015 from http://www.niams.nih.gov/health_info/Polymyalgia/default.asp.
WebMD. Polymyalgia Rheumatica and Temporal Arteritis.7/6/2012.Accessed 2/2013 from http://arthritis.webmd.com/polymyalgia-rheumatica-temporal-arteritis.