Burke, Peter
Princeton University Press, 1986
Buku Teks
Paolo Janni
The council for research in values and philoaophy, 2001
Buku Teks
Vampa, Davide
Palgrave Macmillan, 2016
Buku Teks
Castelfranco, Giorgio
1968, Milano Fratelli Fabri
Buku Referensi
edited by John R. Bowen and Roger Petersen
Cambridge University Press, 1999
Buku Teks