Roozbahani, T., M. Nourian, K. Saatchi, and A. Moslemi. “Effect of Progressive Muscle Relaxation on Anxiety in Pre-University Students: A Randomized Controlled Clinical Trial”. Advances in Nursing & Midwifery, Vol. 27, no. 2, July 2017, pp. 32-37, https://journals.sbmu.ac.ir/en-jnm/article/view/17872.