Thompson, E.A.
Clarendom, 1948
Buku Teks
McGovern, William M., author
University of North Carolina Press, 1939
Buku Teks
Godee-Molsbergen, E.C.
Longman, Green, 1910
Buku Teks
Cambridge University Press , 1929
Buku Teks
Nussbaum, Robert L., author
Saunders Elsevier, 2007
Buku Teks