Miner, Brad, author
Free Press Paperbacks, 1996
Buku Referensi
Seckler-Hudson, Catheryn, author
United State Information Service, 1959
Buku Teks
The America University, [date of publication not identified]
Buku Teks
Palumbo, Dennis J., author
Harcourt Brace College, 1994
Buku Teks
Robert E. Diclerico, Allan S. Hammock, editor
McGraw-Hill, 2009
Buku Teks