Moyer, David S., editor
Martinus Nijhoff, 1975
Buku Teks
Huppe, Bernard Felix
Harpur, 1956
Buku Teks
Downward, Michael
Taylor and Francis, 1998
Buku Teks
Schagrin, Morton L.
Random House , 1968
Buku Teks
Ayer, Alfred Jules, 1910-1989
Dover, 1952
Buku Teks