Gaya APA
Putra, I, M., Ishartadi, A. (2018).
Business model and business plan di era 4.0 (edisi 1).
Yogyakarta:
Quadrant.
Gaya MLA
Putra, Indra, Mahardika., Ishartadi, Arif.
"Business model and business plan di era 4.0".
edisi 1
Yogyakarta:
Quadrant,
2018.
Text.