Wedderburn, Lord
Penguin Books, 1986
Buku Teks SO
Anderson, Franz E.
Burgess Publishing, 1979
Buku Teks SO
edited by Maurice Mandelbaum, Francis W. Gramlich and Alan Ross Anderson
Macmillan, 1958
Buku Teks SO
edited by Maurice Mandelbaum, Francis W. Gramlich, and Alan Ross Anderson
Macmillan, 1957
Buku Teks
edited by Maurice Mandelbaum, Francis W. Gramlich and Alan Ross Anderson
Macmillan, 1957
Buku Teks SO