Quinn, Arthur Hobson, author
Irvington Publishers, 1943
Buku Teks
Commager, Henry Steele, selector
Yale University Press, 1950
Buku Teks
Voice of America Forum Lectures , 1968
Buku Teks
Gultom, Samuel, author
Greenwood Press, 1987
Buku Referensi
Schneider, Herbert W., author
Columbia University Press, 1947
Buku Teks