Gaya APA
Siahaya, W. (2016).
Manajemen Pengadaan Procurement Management ABG (Academic Business Government) (Cet.3).
Bogor:
Penerbit IN MEDIA.
Gaya MLA
Siahaya, Willem.
"Manajemen Pengadaan Procurement Management ABG (Academic Business Government)".
Cet.3
Bogor:
Penerbit IN MEDIA,
2016.
Textbook.