Ayer, Alfred Jules, 1910-1989
Dover, 1952
Buku Teks SO
Barwise, Jon
CSLI Publications, 2000
Buku Teks SO
Schagrin, Morton L.
Random House, 1968
Buku Teks SO
Downward, Michael
Taylor and Francis, 1998
Buku Teks SO
Ayer, Alfred Jules, 1910-1989
Penguin Books, 1980
Buku Teks SO