PURNAMA, I.; KRISPRIMANDOYO, D.; SITEPU, R. The Impact Of Sales Strategies Using The NUP Model On The Performance Of Property Agents (A Case Study In Surabaya, Sidoarjo And Gresik). EKOMBIS REVIEW: Jurnal Ilmiah Ekonomi dan Bisnis, v. 14, n. 1, p. 439–452, 24 jan. 2026.