Holt, Robert T., author
Feffer and Simons , 1966
Buku Teks
edited and introduction by Morris Bornstein
Ballinger , 1975
Buku Teks
Brogan, D.W. (Denis William), author
Harcourt, Brace & World, 1963
Buku Teks
Chilcote, Ronald H., author
Routledge, 2000
eBooks
Curtis, Michael, author
Harper & Row, 1978
Buku Teks