Gaya APA
Siahaya, Willem. (2013).
Manajemen Pengadaan (Procurement Management: Academic, Business, Government) .
Bandung:
ALFABETA.
Gaya Chicago
Siahaya, Willem.
Manajemen Pengadaan (Procurement Management: Academic, Business, Government).
Bandung:
ALFABETA,
2013.
Buku.
Gaya MLA
Siahaya, Willem.
Manajemen Pengadaan (Procurement Management: Academic, Business, Government).
Bandung:
ALFABETA,
2013.
Buku.
Gaya Turabian
Siahaya, Willem.
Manajemen Pengadaan (Procurement Management: Academic, Business, Government).
Bandung:
ALFABETA,
2013.
Buku.