Keith, Michael C., author
Internews Indonesia, 2000
Buku Teks
Seely, Samuel, author
McGraw-Hill, 1956
Buku Teks
Murray, Les A., author
Angus & Robertson, 1977
Buku Teks
Hellman, Charles I., author
Van Nostrand Reinhold, 1956
Buku Teks
Tepper, Marvin, author
John F. Rider, 1961
Buku Teks