Lippmann, Walter, author
The New American Library, 1956
Buku Teks
edited by John K. Ryan
The Catholic University of America Press, 1963
Buku Teks
Vaughn, Lewis, author
Oxford , 2006
Buku Teks
edited by John Herman Randali, Justus Buchler
Barnes & Noble, 1950
Buku Teks
Chen, Liu-Fu, author
Philosophical Library, 1948
Buku Teks