Digital Repositori
Hanim, Lathifah and Noorman, MS. (eds.). (2018) (E-BOOK): UMKM & BENTUK-BENTUK USAHA. UNISSULA PRESS. ISBN 978-602-0754-50-5
Harapap, M.M, Sunarji (2018) (E-BOOK): STUDI KELAYAKAN BISNIS. FEBI UIN-SU Press. ISBN 978-602-6903-25-