The Impact Of Sales Strategies Using The NUP Model On The Performance Of Property Agents (A Case Study In Surabaya, Sidoarjo And Gresik) - Purnama, Indra; Krisprimandoyo, Denpharanto; Sitepu, Rismawati (EKOMBIS REVIEW: Jurnal Ilmiah Ekonomi dan Bisnis, 2026)