Lunato, Christian, Rosario Ceruso, and Riccardo Izzo. “Change in the "goalkeeper wall” Adopted for the Training of Libero in the Volleyball”. Journal of Human Sport and Exercise 15, no. 3proc (September 28, 2020): S609-S618. Accessed May 9, 2024. https://www.jhse.ua.es/article/view/2020-v15-n3-proc-goalkeeper-wall-training-libero-volleyball.