Dooley, Thomas A.
Farrar, Straus and Company, 1958
Buku Teks
Duncan, Tom
John murray, 1985
Buku Teks
edited and commented upon by Robert Ulich
Harvard University Press, 1947
Buku Teks
Gratz, Robert Brandes
John Wiley & Sons, 1998
Buku Teks
Faucett, Lawrence W.
Oxford University Press, 1949
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