Gaya APA
ZILIOLI, U. (2007).
PROTAGORAS AND THE CHALLENGE
OF RELATIVISM (EDISI REVISI).
USA:
Ashgate Publishing Company.
Gaya MLA
ZILIOLI, UGO.
"PROTAGORAS AND THE CHALLENGE
OF RELATIVISM".
EDISI REVISI
USA:
Ashgate Publishing Company,
2007.
Art Original.