Hoebel, E. Adamson, author
Atheneum, 1970
Buku Teks
Bollen, Rhys, author
Wolters Kluwer Law & Business, 2012
Buku Teks
Hoebel, E. Adamson, author
Harvard University Press, 1967
Buku Teks
Henn, Harry G., author
West Publishing, 1983
Buku Teks
Mehren, Arthur Taylor von, author
Little,Brown and Company, 1957
Buku Teks