Cochran, Thomas C., author
Macmillan, 1947
Buku Teks
Tocqueville, Alexis De, author
Vintage Books, 1960
Buku Teks
Katona, George
McGraw-Hill , 1964
Buku Teks
Carlson, John E., author
McGraw-Hill, 1981
Buku Teks
Allen, Frederick Lewis, author
Bantam Book, 1961
Buku Teks