Dye, Thomas R., author
Prentice_Hall, Inc, 1988
Buku Teks
Adrian, Charles R., author
McGraw-Hill , 1978
Buku Teks
Coyle, David Cushman, 1887-1969, author
A Mentor Book, 1963
Buku Teks
Tocqueville, Alexis De, author
Schocken Books, 1961
Buku Teks
Taylor, John
Routledge and Kegan Paul , 1814
Buku Teks