Hollister, C. Warren, author
John Wiley & Sons, 1968
Buku Teks
O`Sullivan, Jeremiah Francis, 1903-, author
Appleton Century Croffs, 1943
Buku Teks
Saul, Nigel, author
Oxford University Press, 2017
eBooks
Lewis, Archibald R. (Archibald Ross), 1914-1990, author
Alfred A. Knopf, 1969
Buku Teks
Coote, Stephen, author
Penguin Group, 1988
Buku Teks