Aini, Nur Syahidah, Ika Kustiani, and Amril Ma’ruf Siregar. “Analisis Investasi Rekayasa Proyek Springhill Condotel Lampung”. Jurnal Rekayasa Sipil dan Desain (JRSDD) 7, no. 1 (March 24, 2019): Hal. 37 – 46. Accessed December 10, 2025. http://journal.eng.unila.ac.id/index.php/jrsdd/article/view/1101.