Vinacke, Harold M., author
Appleton Century Croffs, 1959
Buku Teks
Bryson, Bill, author
Broadway Books, 2006
Buku Teks
Bolton, Geoffrey Curgenven, author
Melbourne University Press, 1958
Buku Teks
Kay, Dennis, author
Twayne, 1995
Buku Teks
Mosby Year Book, 1993
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