Arps, Bernard, author
University of London, 1992
Buku Klasik
edited with an introduction by J.J. Ras
Martinus Jijhoff, 1979
Buku Teks
edited by Edmund S. Morgan
Prentice-Hall, 1965
Buku Teks
Lerner, Laurence D., author
Oxford University Press, 1954
Buku Teks
edited by Joseph T. Shipley
Philosophical Library, 1946
Buku Referensi