Ainsworth, Peter B., author
Pearson Educatios, 2000
Buku Teks
Berle, Adolf A., Jr., author
Harper & Row, [1962]
Buku Teks
Quinney, Richard, author
Little, Brown, 1970
Buku Teks
Cochrane, Willard W., author
University of Minnesota Press, 1964
Buku Teks
Stewart, Rosemary, author
Macmillan, 1993
Buku Teks