Nuri Çetin, Pınar Öztop, Meral Bayramoğlu, Sacide Nur Saraçgil Coşar, and Gamze Özçürümez, “Relation Between Pain, Disability and Depression in Patients with Knee Osteoarthritis”, Archives of Rheumatology, vol. 24, no. 4, pp. 196–201, Dec. 2009.