O`Sullivan, Jeremiah Francis, 1903-, author
Appleton Century Croffs, 1943
Buku Teks
Hollister, C. Warren, author
John Wiley & Sons, 1968
Buku Teks
Lewis, Archibald R. (Archibald Ross), 1914-1990, author
Alfred A. Knopf, 1969
Buku Teks
Davis, H.W.C.
Oxford University Press, 1960
Buku Teks
Hoffman, Ross J.S., author
Littlefield, Adams, 1958
Buku Teks