Baran, Stanley J.
McGraw-Hill, 2004
Multimedia
Unesco Press, 1976
Buku Teks
editors by G. Russell Pipe; A.A.M. Veenhuis
North-Holland Publishing Company, 1975
Buku Teks
edited by Richard M. Bird and Oliver Oldman
John Hopkins, 1967
Buku Teks
United Nations , 1987
Buku Teks