Purnama, I., D. Krisprimandoyo, and R. Sitepu. “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, Vol. 14, no. 1, Jan. 2026, pp. 439–452, doi:10.37676/ekombis.v14i1.8623.