Wedderburn, Lord
The Worker and the law
Penguin Books, 1986
 Buku Teks
Anderson, Franz E.
Laboratory manual for introductory oceanography
Burgess Publishing, 1979
 Buku Teks
Philosophic problems: in introductory book of readings
edited by Maurice Mandelbaum, Francis W. Gramlich, and Alan Ross Anderson
Macmillan, 1957
 Buku Teks
Philosophic problems: an introductory book of readings
edited by Maurice Mandelbaum, Francis W. Gramlich and Alan Ross Anderson
Macmillan, 1957
 Buku Teks
Boyer, Ralph E.
The law of property : an introductory survey
St. Paul Minn, 1991
 Buku Teks