Hayandani, Mutiara, et al. “Analisis Diversifikasi Portofoli Investasi Internasional Terhadap Risiko Dan Return”. Ekopedia: Jurnal Ilmiah Ekonomi, vol. 2, no. 1, Jan. 2026, pp. 2186-97, https://doi.org/10.63822/6x0yh977.