Winchester, A.M., author
Hoghton Mifflin, 1959
Buku Teks
United Nations Educational, Scientific and Cultural Organization, 1977
Buku Teks
Fraser, Alex
McGraw-Hill, 1966
Buku Teks
Lock, Robert Heath, author
Cambridge University Press, 2013
Buku Teks
Glasgow, Joshua, author
Routledge, 2009
Buku Teks