Clarendon Press , 1954
Buku Teks
Thorne, W.J., author
Oxford University Press , 1948
Buku Teks
Beach, Walter Edwards, author
Cambridge, Mass., Harvard University Press
Buku Teks
Palfremen, David, author
Pitman, 1988
Buku Teks
Underhill, Frank H., author
Duke University Press, 1956
Buku Teks