Mahoney, Tom, author
Harper & Row, 1966
Buku Teks
Handlin, Oscar, author
An Atlantic Monthly Press Book, 1973
Buku Teks
McKernan, Michael, author
Nelson, 1984
Buku Teks
Huntington, Samuel P., author
Simon & Schuster, 2005
Buku Teks
Welch, Jack, author
Headline Book , 2001
Buku Teks