Vinacke, Harold M., author
Appleton-Century-Crofts, 1950
Buku Teks
Vinacke, Harold M., author
George Allen and Unwin, 1950
Buku Teks
Vinacke, Harold M., author
Appleton Century Croffs, 1959
Buku Teks
Allen, Richard
Oxford University Press, 1970
Buku Teks
Clyde, Paul H. (Paul Hibbert), author
Prentice-Hall, 1948
Buku Teks