Weinberger, Andrew D., author
Chandler Publishing, 1962
Buku Teks
Gellhorn, Walter, author
Macmillan, 1961
Buku Teks
Douglas, William O., author
Doubleday, 1961
Buku Teks
Brant, Irving
The Nobbs-Merrill, 1965
Buku Teks
Peter, Chris Maina
Greendwood Press, 1990
Buku Teks