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Liandra Khairunnisa and Hafiz Nurdiansyah 2025. THE EFFECT OF THE APPLICATION OF POSITIVE PSYCHOLOGY ON THE DEVELOPMENT OF HUMAN RESOURCE PERFORMANCE AT PT MANDIRI ABADI PERMAI KOTA MEDAN. MEDALION JOURNAL: Medical Research, Nursing, Health and Midwife Participation. 6, 2 (Jun. 2025), 238–245. DOI:https://doi.org/10.59733/medalion.v6i2.204.