GUSNIARTI, U.; WIBISONO, S.; NURTJAHJO, F. E. VALIDASI ISLAMIC POSITIVE THINKING SCALE (IPTS) BERBASIS KRITERIA EKSTERNAL. Jurnal Psikologi Islam, [S. l.], v. 4, n. 1, p. 53–69, 2017. DOI: 10.47399/jpi.v4i1.38. Disponível em: http://www.jpi.api-himpsi.org/index.php/jpi/article/view/38. Acesso em: 1 may. 2026.