APA Style
Putra, I, M.
(2018).
Business Model and business plan di era 4.0
.
Yogyakarta:
Quadrant.
MLA Style
Putra, Indra, Mahardika.
"Business Model and business plan di era 4.0".
Yogyakarta:
Quadrant,
2018.
Koleksi Buku Teks.