Padover, Saul K. (Saul Kussiel), author
McGraw-Hill, 1960
Buku Teks
Madden, Edward H.
University Of Washington Press, 1968
Buku Teks
Higgins, Kathleen
Springer, 2012
eBooks
Huntington, Samuel P., author
The Belknap Press, 1981
Buku Teks
University of Buffalo, 1950
Buku Teks