Buck, Carl Darling, author
Chicago, Chicago University Press 1949
Buku Referensi
Stromberg, Roland D.
Appleton-Century-Crofts, 1968
Buku Teks
Stromberg, Roland N.
Prentice-Hall, 1990
Buku Teks
Durrant, Will
Simon and Schuster, 1957
Buku Teks
Dawson, Christopher
Sheed and Ward, 1946
Buku Teks