Asmar Yulastri, Ganefri, Muharika, Bayu RF, and Febri Prasetya, Buku Ajar Kewirausahaan. UNP PRESS, 2019. Accessed: Jun. 19, 2026. [Online]. Available: https://unppress.unp.ac.id/index.php/unp-press/catalog/book/38