Gaya APA

Xaverius, E, A, R, F. (1999). Right and obligation in Thomas Hobbes. . Roma: Roma Pontificae Universitatis Gregorianae.

Gaya MLA

Xaverius, Eko, Armada, Riyanto,, Franciskus. "Right and obligation in Thomas Hobbes. ". Roma: Roma Pontificae Universitatis Gregorianae, 1999. Buku.