Langer, Susanne K., author
Dover, 1953
Buku Teks
Carnap, Rudolf, author
Dover Publications, 1958
Buku Teks
Langer, Susanne, author
Dover, 1967
Buku Teks
Hurley, Patrick J., 1883-1963, author
Wadsworth, 1984
Buku Teks
Tidman, Paul, author
Wadsworth, 1999
Buku Teks