Robert Tua Siregar; Sukarman Purba; Nurmiati Nurmiati; Mustar Mustar; Arce Yulita Ferdinandus; Susana MW Muskita; Hengki Mangiring Parulian Simarmata; Marisi Butarbutar; Hasdiana S (2022). Manajemen Bisnis. Yayasan Kita Menulis.