PERBEDAAN KESEJAHTERAAN PSIKOLOGIS LANSIA DITINJAU DARI BENTUK DUKUNGAN TEMAN SEBAYA : THE DIFFERENCES IN PSYCHOLOGICAL WELL-BEING OF THE ELDERLY IN TERMS OF SHAPE PEER SUPPORT ABSTRACT . JPPP [Internet]. 2019Sep.3 [cited 2025Aug.21];13(2):59-73. Available from: https://talenta.usu.ac.id/jppp/article/view/2268