LOANA, ELISABETH (2025) ANALISIS INVESTASI PORTOFOLIO OPTIMAL MENGGUNAKAN MODEL MARKOWITZ DAN MODEL INDEKS TUNGGAL (Studi Kasus pada Perusahaan Sektor Energi yang Terdaftar di Papan Utama Bursa Efek Indonesia Periode 2021-2023) = ANALYSIS OF OPTIMAL PORTFOLIO INVESTMENT USING THE MARKOWITZ MODEL AND SINGLE INDEX MODEL (Case Study on Energy Sector Companies Listed on the Main Board of Indonesia Stock Exchange for the Period 2021-2023). Skripsi thesis, Universitas Hasanuddin.