Northrop, F. S. C., author
Macmillan, 1950
Buku Teks
Northrop, F. S. C., author
Macmillan, 1949
Buku Teks
Locke, John, author
Hackett Publishing Company, Inc., 1996
Buku Teks
Locke, John, author
J.M. Dent & Sons, 1959
Buku Teks
Locke, John, author
J.M. Dent & Sons, 1947
Buku Teks