Kowark, A., Adam, C., & Henzler, D. (2018). Improve hip fracture outcome in the elderly patient (iHOPE): A study protocol for a pragmatic, multicentre randomised controlled trial to test the efficacy of spinal versus general anaesthesia. BMJ Open.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Kowark, Ana, Christian Adam, و Dietrich Henzler. "Improve Hip Fracture Outcome in the Elderly Patient (iHOPE): A Study Protocol for a Pragmatic, Multicentre Randomised Controlled Trial to Test the Efficacy of Spinal Versus General Anaesthesia." BMJ Open 2018.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Kowark, Ana, et al. "Improve Hip Fracture Outcome in the Elderly Patient (iHOPE): A Study Protocol for a Pragmatic, Multicentre Randomised Controlled Trial to Test the Efficacy of Spinal Versus General Anaesthesia." BMJ Open, 2018.