Jualina Widyawaty, Jenas Pardomuan Sihotang, Jepni Piola Togatorop, Iwan Julius Gulo, and Jhon Ferinando Tarigan, “The Effect Of Problem-Solving Learning Methods On The Accuracy Of Underhand Passes In Girls’ Volleyball At SMP N 2 Hamparan Perak Deli Serdang”, JPHR, vol. 6, no. 2, pp. 423-433, Dec. 2025.