Neal, Harry Edward, author
Julian Messner, 1967
Buku Teks
edited Archie Brown and Jack Gray
Holmes & Meier, 1979
Buku Teks
McRobert, Kenneth
McClelland and stewart, 1976
Buku Teks
Lloyd, P.C
Frederick A. Praeger, 1968
Buku Teks
Frederick A. Praeger, 1969
Buku Teks