Kuczynski
OxfortUniversity Press, 1949
Buku Teks
Creighton, Donald G.
Macmillan of Canada, 1970
Buku Teks
Lee, Jong-bom, author
Sogan, 2006
Buku Teks
Viton, Albert
John Day , 1943
Buku Teks
Williamson, James A., author
Macmilan and Co,, 1950
Buku Teks