Gaya APA
Phitagoras, P. (2008).
Pt. Phitagoras global duta Training and consulting services .
Surabaya:
Pt. Phitagoras global duta.
Gaya MLA
Phitagoras, Pt..
"Pt. Phitagoras global duta Training and consulting services".
Surabaya:
Pt. Phitagoras global duta,
2008.
Monograf.