Gatta, John, author
Oxford University Press, 2004
Buku Teks
Fraser, John
Cambridge University Press, 1984
Buku Teks
United State Information Agency, 1994
Buku Teks
edited by Richard Kostelanetz
United States International Communication Agency, 1982
Buku Teks
Matthiessen, F.O., author
Oxford University Press , 1941
Buku Teks